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Amplifier Modules and PCBs For Sale

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#84
CharlieLaub said:
Have you been able to finish any of the new boards and test?
Click to expand...

Not yet finished, I was busy tweaking my modified BAKSA which I started assembling years ago.

For the JLAudiophile-250D, the speaker protection part is already tested. It's almost finished but I have some parts that did not arrive yet. I also have to go to aluminum shop first to have the heatsinks cut. I'll finish it within 2 weeks. 🙂
 
#87
Done right the first time. 🙂

I just used components on my parts bin because the items I ordered from mouser was taxed almost the same price of the items I ordered. So I refused to receive my package. Our bureau of customs here sucks.

I used IRFB5615, 18uh T106-6 Inductor, +-35VDC rails. The osc. freq. is 365kHz when the trimmer is 0 ohm.

No hiss, tweeter is dead silent when connected (unlike other ebay irs2092 designs). As expected with IRS2092 based amps, it has a very good sound. 🙂

The heatspreader and the inductor don't even get warm after 30mins, but I'm using +-35VDC rails which explains why voltage regulator for mosfet driver emits minimum heat.

I'll replace the inductor later with Coilcraft AGP2923-223KL.
 

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#90
jlester87 said:
Done right the first time. 🙂

I just used components on my parts bin because the items I ordered from mouser was taxed almost the same price of the items I ordered. So I refused to receive my package. Our bureau of customs here sucks.

I used IRFB5615, 18uh T106-6 Inductor, +-35VDC rails. The osc. freq. is 365kHz when the trimmer is 0 ohm.

No hiss, tweeter is dead silent when connected (unlike other ebay irs2092 designs). As expected with IRS2092 based amps, it has a very good sound. 🙂

The heatspreader and the inductor don't even get warm after 30mins, but I'm using +-35VDC rails which explains why voltage regulator for mosfet driver emits minimum heat.

I'll replace the inductor later with Coilcraft AGP2923-223KL.
Click to expand...
why do you think this design has very low noise?

do you think that using boutique components in certain places would improve the sound?
 
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#92
cats squirrel said:
why do you think this design has very low noise?
Click to expand...

The layout is an important consideration for noise, my layout looks simple but if you examine it closely, the parts are positioned carefully to minimize current loops. Bypass caps are very close to the supply pins of the IC and the mosfets, no compromises have been made 😉 . And I used different shielding planes for noise sensitive areas and noise generating areas which minimizes the noise coupling between them.

cats squirrel said:
do you think that using boutique components in certain places would improve the sound?
Click to expand...
One thing you can experiment with is the input cap. I think there is no need for boutique components in other places because IRAUDAMP7 already uses mosfets with good key parameters, and has a good deadtime setting. The choice of low pass filter components also affects the THD. The filter cap should be of polypropylene type for low distortion. And use good inductor, like the Sagami 7G17A which uses OFC wires.
 
#94
Testing JLAmp1200D on 1 pair IRFP90n20D, all parts are cool except for the 1/2W gate resistor. I'll test it next weekend if it can handle 1KW into 2 ohms load.
 

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#97
JLAmp1200D with Soldered SMD Totem Pole buffer available on my eBay page.

All through hole parts assembly. Can be used with various loads and voltages up to +-120V DC.
 

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#99
JLAudiophile-250D Assembled Modules soon...
(No heatsink included for cheaper shipping price)
 

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