Yes you can, these are half-bridge designs. There's no onboard bridging circuit so you have to use an external one.
But do you think it still will be able to drive 2 ohms?
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Deleted member 148505
But do you think it still will be able to drive 2 ohms?
No, minimum impedance should be 4 ohms if used in bridge mode.
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Deleted member 148505
Have you been able to finish any of the new boards and test?
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.
No, minimum impedance should be 4 ohms if used in bridge mode.
most people state not to bridge output into 4 ohms, only 8 ohms. Is this true in this case?
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Deleted member 148505
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.
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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Deleted member 148505
Nice!
I'm definitely interested in these, too...
Do you think that you will sell PCB only or built boards?
Thanks!
Will sell only PCBs in the meantime. I don't have the items yet.
For those who want to build it, here's the BOM <click here>
why do you think this design has very low noise?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.
do you think that using boutique components in certain places would improve the sound?
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Deleted member 148505
why do you think this design has very low noise?
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.
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.do you think that using boutique components in certain places would improve the sound?
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Deleted member 148505
What is the maxium VDC The JLAudiophile-250D can be used with?
+-70VDC max.
I created BOM for +-56VDC max and +-70VDC max supplies.
You can use 80VDC max if you'll use a separate VCC supply for IRS2092 and use 100V ratings for bypass/decoupling caps, some resistors should also be adjusted accordingly.
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Deleted member 148505
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Deleted member 148505
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Deleted member 148505
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.
All through hole parts assembly. Can be used with various loads and voltages up to +-120V DC.
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