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100W Ultimate Fidelity Amplifier
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Old 30th November 2020, 11:12 AM   #13331
corvo72 is offline corvo72  Italy
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only +/- 10 V different?
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Old 30th November 2020, 12:01 PM   #13332
bullittstang is offline bullittstang  United States
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100W Ultimate Fidelity Amplifier
Depends on your speaker impedance (load)
+/-65 for 8-ohm and I wouldnít use at 4-ohms often or at high volume.

For 4-ohm stability and 2-ohm dips I would suggest +/-55Vdc.

You can use higher voltages, but will decrease SOA and dependability. I usually push the limits, but I also donít mind rebuilding an amp if it blows up.
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Old 30th November 2020, 12:11 PM   #13333
corvo72 is offline corvo72  Italy
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Ok, I well noted! I normally use 8 ohm audio towers (independently speakers box connected to passive crossover). thank you bullittstang for your explanation!
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Old 30th November 2020, 12:16 PM   #13334
bullittstang is offline bullittstang  United States
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If you use the transistors specíd (didnít look them up prior) you should be safe with +/-65Vdc, they are 250V 200W parts.
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Old 30th November 2020, 01:00 PM   #13335
corvo72 is offline corvo72  Italy
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using as an example, originaly BX22 with 2 pair of power transistors 2SC5200 & 2SA1943 as per sheme attached, if I decrease the power supply to 65V, the 10 ohm resistors in series to the supply of primary stage, must decrease theire value?
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Old 30th November 2020, 01:15 PM   #13336
bullittstang is offline bullittstang  United States
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Not 100% sure - maybe someone else will chime in to confirm, but I wouldnít think it does.
I would not use +/-65 with those BJTs, you would need to step up to their big brother version.
MJL3281/1302 or MJL4281/4302 the bigger brother
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Old 1st December 2020, 04:05 PM   #13337
apexaudio is offline apexaudio  Serbia
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Quote:
Originally Posted by corvo72 View Post
Thank you Mr Mile for your prompt repplay. If I want to use only 2 pair of 2SC5200 & 2SA1943 instead of six, how much should I reduce the supply voltage?
There are something to change (resistors) for what above?
Go to AX20
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Old 1st December 2020, 05:01 PM   #13338
kozard is online now kozard
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To build the AX40 should I use the v1.4 gerbers in post #2 of the AX40 build thread? Are those the correct/best/latest?

The top copper has a single arc (looks like to indicate the jumper wire location). Should these be ordered as single or two layer boards at PCBWAY or JLCPCB? I ask since I don't see capture pads on the top copper layer, only the arc for the jumper wire location, so I am not 100% sure.
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Old 1st December 2020, 07:33 PM   #13339
apexaudio is offline apexaudio  Serbia
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P40
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Old 2nd December 2020, 10:17 AM   #13340
apexaudio is offline apexaudio  Serbia
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P4S
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