Great work Fran. Very impressive.
I've got an old Myryad MA120 power amp that I havent used in many years. No idea if it works anymore. You're welcome to take it and rip it apart. Should have a good power supply and it has a lovely case.
Building a chip amp
Re: Building a chip amp
"I may skip. I may even warp a little.... But I will never, ever crash. I am your friend for life. " -Vinyl.
Michell Gyrodec SE, Hana ML cart, Parasound JC3 Jr, Stax LR-700, Stax SRM-006ts Energiser, Quad Artera Play+ CDP
Michell Gyrodec SE, Hana ML cart, Parasound JC3 Jr, Stax LR-700, Stax SRM-006ts Energiser, Quad Artera Play+ CDP
Re: Building a chip amp
Thanks Dave - yes indeed I would be interested.
It might be interesting some time to try the chip amp with the kharmas too - although its not a class D amp like Kharma's own....
Fran
It might be interesting some time to try the chip amp with the kharmas too - although its not a class D amp like Kharma's own....
Fran
Do or do not, there is no try
Re: Building a chip amp
Sure thing. Let me know whenever it suits you once you got the amp built.Fran wrote:Thanks Dave - yes indeed I would be interested.
It might be interesting some time to try the chip amp with the kharmas too - although its not a class D amp like Kharma's own....
Fran
"I may skip. I may even warp a little.... But I will never, ever crash. I am your friend for life. " -Vinyl.
Michell Gyrodec SE, Hana ML cart, Parasound JC3 Jr, Stax LR-700, Stax SRM-006ts Energiser, Quad Artera Play+ CDP
Michell Gyrodec SE, Hana ML cart, Parasound JC3 Jr, Stax LR-700, Stax SRM-006ts Energiser, Quad Artera Play+ CDP
Re: Building a chip amp
Fair play to you FRAN. Lovely work, can't wait to hear it.
It's OK, if there is no bread I will eat cake.
Beware of a thin chef!
Beware of a thin chef!
Re: Building a chip amp
Another year, another project :) Well done Fran.....
Re: Building a chip amp
Final pics....
Not much has changed in the internals from the last pics, but I used a stepped DACT type attenuator instead of the Alps blue velvet shown in the earlier pics. I added bigger capacitors in the power supply as well, and lastly, I changed the resistors that set the overall gain of the amp to LDRs. These last ones are worth a mention. They are light dependant resistors - in other words, resistors whose resistance changes depending on the amount of light to fall on them. The particular ones I have used (and the ones that are used by all in audio around the world) are from a company called Silonex, and are actually a package of the resistor, plus an LED. So the idea is that the amount of power you put through the LED creates a certain amount of brightness, and therefore a certain resistance. If you can do that accurately, then the resistance is dead on accurate. Anyway, it turns out that these resistors seem to have a kind of magical sound quality. Example: I had used audiophile kiwame resistors in this position. Well regarded ones.... but when I added in the LDRs I got a better, more defined, cleaner presentation.
Anyway, I think she's kinda finished now. I might go back sometime and do another one with 2 chips per channel paralleled which is meant to give a higher power output, but its not something I feel the need to go for right away.
Excuse the fingerprints on the fascia: I thought I had them all off!
Fran
Not much has changed in the internals from the last pics, but I used a stepped DACT type attenuator instead of the Alps blue velvet shown in the earlier pics. I added bigger capacitors in the power supply as well, and lastly, I changed the resistors that set the overall gain of the amp to LDRs. These last ones are worth a mention. They are light dependant resistors - in other words, resistors whose resistance changes depending on the amount of light to fall on them. The particular ones I have used (and the ones that are used by all in audio around the world) are from a company called Silonex, and are actually a package of the resistor, plus an LED. So the idea is that the amount of power you put through the LED creates a certain amount of brightness, and therefore a certain resistance. If you can do that accurately, then the resistance is dead on accurate. Anyway, it turns out that these resistors seem to have a kind of magical sound quality. Example: I had used audiophile kiwame resistors in this position. Well regarded ones.... but when I added in the LDRs I got a better, more defined, cleaner presentation.
Anyway, I think she's kinda finished now. I might go back sometime and do another one with 2 chips per channel paralleled which is meant to give a higher power output, but its not something I feel the need to go for right away.
Excuse the fingerprints on the fascia: I thought I had them all off!
Fran
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Do or do not, there is no try
Re: Building a chip amp
It's lovely. Looking forward to hearing it sometime.
Vinyl -anything else is data storage.
Thorens TD124 Mk1 + Kuzma Stogi 12"arm, HANA Red, Gold Note PH 10 + PSU. ADI-2 Dac, Lector CDP7, Wyred4Sound pre, Airtight ATM1s, Klipsch Heresy IV, Misc Mains, RCA + XLR ICs, Tellurium Q spkr cable
Thorens TD124 Mk1 + Kuzma Stogi 12"arm, HANA Red, Gold Note PH 10 + PSU. ADI-2 Dac, Lector CDP7, Wyred4Sound pre, Airtight ATM1s, Klipsch Heresy IV, Misc Mains, RCA + XLR ICs, Tellurium Q spkr cable
Re: Building a chip amp
Excellent work as usual Fran!
To be is to do: Socrates
To do is to be: Sartre
Do be do be do: Sinatra
To do is to be: Sartre
Do be do be do: Sinatra
Re: Building a chip amp
very impressive Fran. Lovely neat finish too.
"I may skip. I may even warp a little.... But I will never, ever crash. I am your friend for life. " -Vinyl.
Michell Gyrodec SE, Hana ML cart, Parasound JC3 Jr, Stax LR-700, Stax SRM-006ts Energiser, Quad Artera Play+ CDP
Michell Gyrodec SE, Hana ML cart, Parasound JC3 Jr, Stax LR-700, Stax SRM-006ts Energiser, Quad Artera Play+ CDP