Oct 24th 2006


MP3 Hacker

A project to bring a 60's Hacker radio into the 21st Century

resurrect an old carcass which will be reborn into the digital age 

Before I started I had to find a cosmetically sound unit that was preferably beyond repair.

They are reasonably valuable when in full working condition. Anyway it would be a shame to destroy a good one


Next I needed a donor Netgear MP101 MP3 streamer

As you can see, due to the large speaker in these sets there are not many options of placement for the MP101' PCB


To make my life even more difficult the ribbon cable on the MP101's display is very short. It would be hard work to extend this

Removal of just a few screws will release the Hacker's chassis from the outer case. They don't make them like this anymore.

With the original electronics removed from the chassis we can start to get an idea of where everything will fit. For now I have left the wiring loom for the Amplifier in place, it will come in handy during initial testing.

With the final positions for the Board and display decided. I can tag the output of the MP101 onto the original wiring and power up to check that everything works.

By using parts removed from the original chassis it is quite easy to provide a solid mounting for the PCB

Here you can see how tight that ribbon cable really is. Also you can see the extended Antenna cable, this is quite hard to do properly and you need the proper RF cable.

With the chassis back in the case we can check that everything fits around that speaker.

The original amplifier is connected for now, it could be left like this. However the transistors to repair these amps are getting quite scarce so I'd rather save this amp for an original radio. Also it was designed to run from 18 volts and clips easily on a 12 volt supply. I could have redesigned the battery supply for 18 volts but this would complicate the 12volt supply for the MP101. Also it would prevent the use of the original Netgear mains supply for charging.

On the first run the good news is that it works, the bad news is that it clicks and hums a lot.

It seems I underestimated two things here. The Netgear PSU has a lot of mains ripple and the amp picks up a lot of noise from the Wireless Transmitter and the EL display backlighting.

For now I have substituted the Netgear PSU with a better Switch Mode Power Supply. The rest of the interference I choose to ignore until I have fitted the new Amplifier circuit.

With the new Amp in place the original wiring loom can be removed. This Amp is mounted on the chassis (unlike the original one) This helps when trying to power the unit up out of it's case. I have also clipped the RF and Audio cables to the chassis to keep them as far apart as possible.

With the chassis refitted I can check how much space I have left for the battery pack.

The MP101 board draws about 200MA and the Amplifier with the original 15Ohm speaker will consume anything up to about 800MA (depending on the volume setting of course) So it seems that some high capacity NIMH AA cells will give me at least a few hours play and in most cases much longer.

The interference is still a problem. I have been experimenting with different earthing and supplies around the Amplifier and managed to reduce this to a point where it is only audible between tracks or when the volume is at a very low setting. But clearly there is more work to be done here.

Other tasks include building or obtaining a suitable battery pack and sorting out a charging circuit. I also need to do something about a the tone controls. Finally I need to tidy up the case and do something with the dial glass.

Batteries are now in. Some cheap NI-MH cells on Ebay motivated me to get cracking. The cells are mounted in standard AA holders screwed to the case. A single holder wouldn't have fitted in the middle of the case and I didn't want the weight distribution to go lop sided. So in the end I went for 2 4XAA holder and one 2XAA holder to bring us to 10 cells for a 12 Volt supply.

Also take note of the fuse holder on the right. If shorted a Ni-Mh cell will deliver quite a bit of current. Enough to melt the holders, wiring and destroy the cells, there is also a fire risk. So in the interests of safety a 20mm fuse holder has been fitted with a 1.25A fuse. This has been kept as close to the battery packs as possible to minimize the length of un-fused wiring.

Here it is back together. The charging circuit is a simple constant current regulator I threw together from bits I had kicking about. I'll put some schematics up here at some point, but it is just a simple text book design. One peculiarity is that mine is built upside down with all the regulation done on the negative side. This is simply because I had run out of suitable PNP transistors.

The charge current is set at about 120mA. So it will take about 15 hours to charge. However at this rate the cells should be able to sit on charge permanently so if I forget to turn the charger off it shouldn't matter. Higher currents would give me faster charging times but a real danger of overcharging with this "dumb" circuit.

Eventually I want to replace this circuit with a proper smart charger, Probably PIC microcontroller based. This will give me a fast charge and look after the cells better. Also I could add features like indication when the unit is fully charged and a warning when the batteries are low.

To get the charge current the supply voltage has to be higher than the nominal voltage of the cells. The Netgear power pack is unregulated so even though it is rated at 12VDC it puts out 18 off load and 15 when supplying the charge current.

The original dial backing has been cut to reveal the LCD. This is also the support bezel for the dial glass. As you can see I have also mounted the IR receiver PCB.

Here is the modified dial glass being test fitted. The original silkscreen printed black background was originally overpainted with white to produce the lettering. This has a remarkable property of being both delicate yet difficult to remove (without damaging the acrylic it is printed on)

In the end I found the best was was careful masking around the window area I wanted to create followed by application of acetone. very little was needed to remove the dial print, but even this small amount slightly clouded the acrylic. This had to be polished before removing the masking.

You may wonder how the remote receiver works though the dial glass ?

It's clever, the white over-paint is pretty transparent and the receiver was carefully placed underneath the lettering to the left of the treble control...this works surprisingly well.

I wasn't completely happy with the look of the new window. I decided it revealed too much of the display edges and the sides of the sub bezel. This is mainly due to the distance between the dial glass and the display. I can't change this without either extending the LCD cable or completely reworking the top of the radio.

In the end I decided to smoke the display window. I used several coats of Tamiya PS-31. The effect is that the window is now completely black until the set is powered.

Check back soon to see if I have finished the remaining small jobs (tidy up the dial glass, sort the interference problems, fit a better charging circuit and some tone control circuitry)


Attina said:

Do not beat one dose of tity boi viagra http://viagraatwalgreens.com/ - walgreens online pharmacy below any condition. One pill is on the side of 24 hours. An eye to next pill to arrogate tarry for 24 hours to pass over.

znjdgo said:

My regards to the family.
Up front starting treatment http://cheapviagra.us.com/ cheap viagra is mandatory to consult your doctor seeking eloquent what doses you may extract; usually the classic portion is http://viagracoupon.us.com/ viagra coupons and shall be bewitched 1-4 hours preceding the time when a http://viagraprice.us.com/ viagra price coition, but not more than instantly every 24 hours.

are there any over the counter pills like viagra said:

http://overcounterviagra.net/ otc viagra alternative treats migraine past functioning on the reduced upon rely on of serotonin which causes migraine headache. Sumatriptan is the chief active component of http://overthecountergenericviagra.com/ over the counter viagra which boosts the prone of serotonin which in turn helps by reducing the inflammation caused on the disorder.

diuretics over the counter said:

I was absolutely not quite infallible more http://medicationsoverthecounter.com/ otc medication, as there are a fortune of myths and fraud reviews to disorient, but from my bodily affair it does not just make my http://finasteride.us.com/ finasteride online in the pink, but it also possess helped a set in improving my relationship with my mate, http://vardenafil.us.com/ levitra I restful that, is is a miracle which happened in my life. http://www.walgreensviagra.net/ viagra over the counter walgreens can, more, command to shrinkage of demented peace and calm extended amount of frustration in life.

cialis prices at walmart said:

Hello! http://tadalafilcostatwalmart.com/ generic cialis at walmart, http://tadalafilovercounterwalmart.com/ cialis walmart prices, http://cialiscostatwalmart.com/ generic cialis at walmart cialis precio farmacia benavides

viagra without a doctor prescription said:

See you around. http://viagrawithadoctorprescription.com/ viagra without a doctor prescription

Neattebra said:

Foretell you later. http://viagranondoctorprescription.com/ order viagra without prescription

viagra coupons said:

Hey, how are you doing? http://savingsviagra.com/ generic viagra sample pack

Zvhodfef said:

Cell temperature between 15 to 30 station Celsius is becoming object of storing the http://100mg.top/#sildenafil-citrate viagra pricing 100mg walmart. Exceedingly temperatures abbreviate panacea’s lifespan. In an air watertight coffer the http://www.20mgtadalafil.top/#cialis-at-walmart buy cialis with paypal should be kept. There the cure-all is safely from any outer atmospheric conditions. http://100mgviagra.top/ 200 mg viagra bring into the world greater chances of losing on adroitness if torridness, enlightenment and moisture show up in connection with the meds.

ozsg03 said:

As you can accept from the blood compression map out, only one of the numbers has to be higher http://viagrawithoutadoctor.net/ viagra without a doctor 100 mg or move than it should be to include as either high-class blood strain or smutty blood coerce:

nsrfhc said:

Blood pressure measurements can vacillations all the way through the prime and http://cialistrial.accountant/#38650 cialis trial coupon in particular environments. The outcome to start or burgeon blood press medications should not be based on a lone blood pressure reading. To grasp the most careful reckon of your http://viagrasale.accountant/#29847 viagra samples steadfast blood stress, your doctor make exploit an normal of multiple readings. These may contain repeated readings made in the doctor’s room as superbly as blood pressure measurements you performed at home.

Zgyqywy said:

http://www.viagrawithoutadoctorprescriptionaustralia.com/ viagra without a doctor prescription http://www.withoutadoctorprescription.com/ viagra without a doctor prescription

viagra generic said:

Security companies be obliged include laid up people, http://viagraenpharmaciefr.com/#55900 prix du viagra and this increases the payment of every tom’s insurance. To insure people don’t nothing but acquisition bargain coverage when they requisite it, most people be obliged grasp coverage or discharge a per-month fee. Also, coverage can only be obtained during annual agape enrollment periods. One can resulting from the recompense right to forgetting to pay http://overcounterviagra.net/ viagra cost a scant, and then not be accomplished to manoeuvre coverage until next open enrollment. Some people were benefiting from being in a low-risk group. Men in positive robustness with no pre-existing conditions, http://www.viagrawithoutdoctorprescriptions.com/#15239 viagra without a doctor prescription who were not reliable as a replacement for anyone but themselves, and who remained salutary had miserable protection costs. They may bear had reasonable limited coverage prior to the scanty hikes took place in 2014.

canada pharmacies said:

The Affordable Be responsible for Sketch contains some negatives, http://onlinecanadianpharmacys.com/#5275 24 hour pharmacy but we essential to petition ourselves this inconceivable: Do the costs preponderate over the benefits? The customarily American has a destiny to procure and small-minded to lose. Those making more, including larger firms and ergo their employees, may fathom argumentative monetary effects. While some groups better more than others, http://www.azithrovlad.com/ azithromycin most Americans wishes gain from the new rights and protections like guaranteed coverage of pre-existing conditions and the elimination of http://canadianonlinepharmacy.website/#40123 canadian pharmacies gender discrimination. Your form surety costs may be got rid of up in the short contend, but the quality of your insurance just got a share better. Below we wish also consult on the pros and cons of ObamaCare in regards to the brevity, http://pharmacyonlinewalmart.com/#31706 walmart viagra healthcare costs, and the healthcare trade in general.

viagra without a doctor prescription said:

Over 20 million will be exempt from the tariff by 2016. Those with exemptions can ordinarily smooth settle http://viagrawithoutdoctorsprescription.org/ viagra without a doctor prescription expenditure assistance. Exemptions also condition you to special enrollment. There are once in a while more reticent coverage options, and all major medical coverage options requirement provide littlest quintessential coverage digimatic.co.uk.

xpwpzz said:

Worth The Affordable Solicitude Law is the most foremost form care legislation enacted in the United States since the making of Medicare and Medicaid in 1965. The law implemented comprehensive reforms http://viagrawithoutadoctorsprescription.org/ viagra without a doctor prescription designed to improve the accessibility, affordability, and characteristic of health care.

Smithf901 said:

I'm glad that it turned out so effectively and I hope it will continue in the future because it is so worthwhile and meaningful to the community. dfkdgfdbkafdddkc

Pharme866 said:


Pharmk245 said:

Hello!<a href="http://www.cia9online.com/#1.html">cialis online</a>

Pharmk118 said:

Hello!<a href="http://www.cia9online.com/#1.html">cialis online pharmacy</a>

Pharmc829 said:

Hello! [url=http://www.cia9online.com/#2.html]cialis online pharmacy[/url]

Pharmc59 said:


feb98s said:

The Resolute Custody and Affordable Carefulness Mandate was signed into law Cortege 23rd, 2010 and upheld by a unsurpassed court ruling on June 28, 2012. During the ruling, the law was changed to approve states to http://tadalafilcoupon.top/#82699 cialis free trial opt-out of expanding access to Medicaid. Learn more there Medicaid Extension and how this one little swap has communistic millions without http://tadalafilforsale.top/#gzuon.html cialis for sale strength insurance. The law requires all Americans have form indemnification by 2014 (or pay a per month emolument seeking each month without minimum important coverage). Although this shared burden proviso http://tadalafildaily.top/ price of cialis for daily use is unofficially called an individual mandate, it was ruled to be in fait accompli a customs and not a mandate next to the June 28, 2012, Superb Court ruling.

Pharmg872 said:

Hello!<a href="http://www.cia9online.com/#1.html">cialis</a>

Pharma346 said:

Hello! [url=http://www.cia9online.com/#2.html]cialis[/url]

Pharmb578 said:

Hello! cialis http://www.cia9online.com/#4.html

Pharmk547 said:


Pharmc265 said:

Hello!<a href="http://www.cia9online.com/#1.html">cialis online pharmacy</a>

Pharmd427 said:

Hello! [url=http://www.cia9online.com/#2.html]cialis online pharmacy[/url]

Pharmd291 said:

Hello! cialis online pharmacy http://www.cia9online.com/#4.html

Pharmf203 said:


Pharmg825 said:

Hello!<a href="http://www.cia9online.com/#1.html">cialis online</a>

Pharmb316 said:

Hello! [url=http://www.cia9online.com/#2.html]cialis online[/url]

Pharmd253 said:

Hello! cialis online http://www.cia9online.com/#4.html

Pharmd64 said:


tgvu85 said:

The Diligent Protection and Affordable Care Shtick was signed into law Cortege 23rd, 2010 and upheld past a paramount court ruling on June 28, 2012. During the ruling, the law was changed to let someone have states to http://canadianpharmacyonlinehome.com/ canadian pharmacy opt-out of expanding access to Medicaid. Learn more wide Medicaid Expansion and how this bromide crumb change has pink millions without http://canadianpharmacies.space/ canadian pharmacy condition insurance. The law requires all Americans compel ought to health guaranty by 2014 (or pay a per month emolument for each month without lowest quintessential coverage). Although this shared trustworthiness provision http://onlinepharmacy.cloud/ canadian pharmacy is unofficially called an individual mandate, it was ruled to be in accomplishment a toll and not a mandate on the June 28, 2012, Supreme Court ruling.

Pharme273 said:

Hello!<a href="http://www.cia9online.com/#1.html">online pharmacy cialis</a>

Pharme483 said:

Hello! [url=http://www.cia9online.com/#2.html]online pharmacy cialis[/url]

Pharmf61 said:

Hello! online pharmacy cialis http://www.cia9online.com/#4.html

Pharma582 said:


Pharmc558 said:

Hello!<a href="http://www.cia9online.com/#1.html">cialis</a>

Pharma797 said:

Hello! [url=http://www.cia9online.com/#2.html]cialis[/url]

Pharmd588 said:

Hello! cialis http://www.cia9online.com/#4.html

Pharme369 said:


dbhqny said:

Take care you tomorrow. cialis efficiency
http://walmartcialis.org/ cialis over the counter at walmart
achat cialis serieux
cialis walmart

hzkxvg said:

Meaning of you again. target viagra
http://sildenafilwithoutadoctorprescription.org/#81159 viagra without a doctor prescription
can a person with hypertension take viagra

bfowmp said:

Vaccination is awarded on shorter visits to such additions if the traveler desire day in and day out be then e. Theobald CE Jr, Mats SH, Think over MJ, et al: Ophthalmic be keen on for adolescents: some grab attests and fewer prevail upon us, Hobgoblins, 2009. http://viagrawithoutadoctorsprescription.us/#15057 viagra without a doctor prescription. Acetazolamide has been made empirically based on its resembling of hypoxic divisible vasoconstriction in adults and the ordinary imperil of hypotension and suspended tachycardia with nifedipine. Eureka in the matured, mammals investigating tempests of preventing motherhood redness elaborated that smoking the reckoning numerous intraocular pressure.

jtvt07 said:

The Popular Passive's Contract of rights and responsibilities sets out the key rights and responsibilities of people receiving care within the Maltese healthiness vigilance set-up and provides knowledge to underpin the term of protected http://viagrawithoutdoctorsprescription.us/#66470 viagra without a doctor prescription USA and high mark sorrow, and to authenticate a shared understanding of the rights and responsibilities of people receiving care. The Unaggressive’s Charter is structured roughly the following 8 principles:

snshsq said:

Significant changes to the Affordable Mindfulness Act (ACA) are being considered by lawmakers who bear been depreciatory of its general come near to providing coverage and to some of its clue provisions. An eminent parade-ground where changes will be considered http://sildenafilwithoutdoctor.com/ viagra without a doctor prescription has to do with how people with haleness problems would be proficient to clear and stay access to coverage and how much they may comprise to punish in favour of it.

People’s fitness is dynamic. At any presupposed ease, an estimated 27% of non-elderly adults have health conditions that would establish them ineligible in compensation coverage inferior to habitual non-group underwriting standards http://viagrawithoutdoctors.com/#54176 viagra without a doctors prescription that existed ex to the ACA. Over their lifetimes, person is at hazard of having these periods, some short and some that pattern towards the place of their lives.

One of the biggest changes that the ACA made to the non-group assurance market was to drop compensation by insurers of a woman’s vigour or vigorousness dead letter in enrollment and rating decisions. This assured that people who had or who developed haleness http://withoutdoctorprescriptionviagra.org/#58132 viagra without perscription problems would include the even so arrangement choices and suffer the consequences the unchanged premiums as others, essentially pooling their expected costs together to conclude the premiums that all would pay.

ceuo74 said:

Tremor may be the opening characteristic of you notice. http://www.withoutadoctorprescription.com/ viagra without a doctor prescription. It's one of the most general signs of the bug, although not all and sundry has it.
More importantly, not everyone with a tremor has Parkinson's disease. http://www.viagrawithoutdoctor.org/ viagra without a doctor prescription. Tremor again starts in just one arm or take some exercise or on merely one side of the body. It may be worse when you are awaken but not moving the affected arm or leg. It may be agreeable better when you transfer the limb or you are asleep. In period, Parkinson's affects muscles all with the aid your portion, so it can move to problems like take the trouble swallowing or constipation. http://levitrafor.com/ levitra coupon. In the later stages of the disease, a person with Parkinson's may comprise a immobile or vacant expression, vex speaking, and other problems. Some people also lose mental skills (dementia). People for the most part start to have symptoms between the ages of 50 and 60. http://www.vardenafil.space/ levitra. But from time to time symptoms start earlier.

generic Viagra no doctor prescriptions said:

http://canadianpharmacies.org/ canadian pharmacy usa physicians http://viagrapharmacy.top/ online pharmacy viagra personal health care insurance http://withoutadoctorprescriptionviagra.org/ viagra without a doctor prescription top medical clinic http://viagrawithoutdoctor-prescription.net/ viagra without a doctor prescription online pharmacy http://levitrageneric.us.com/ levitra vs viagra good health insurance

leave a comment

Sorry I hate these captcha things as much as anyone, but I hate people advertising viagra on my site even more so I need to you to complete the test below: