I have add a balance control to the P30ZF, Is this schematic modification is correct ?
Thank Mile
Attachments
Follow-up on Apex A9 amplifier
Dear all,
Here is a short (and probably final) follow-up on my posts # 12984 and 12986 in this enormous thread. I have now put my homemade Apex Audio A9 amplifier PC boards with power supply in a (recycled) cabinet (19", steel). The power supply lines run at ± 37V. I have not modified mr. Slavkovic's schematic in any way, with a reduction of the series resistors for the Z15 zeners as the only exception (see post 12984). The amp really sounds great, it sings! (as is said on the Russian Komitart site). However, I disagree with one statement made by our Russian friends - they mention that quiescent current through the power MOSFets should be set to 15 mA. In my ears, this is not correct, Iq should be set to 30 mA or a bit higher (as was also said by Mr Slavkovic). Purity of the sound is much better at the higher quiescent current, and the heatsinks don't even become lukewarm. Anyhow, this project can be strongly recommended.
My amp is a dual mono setup (each channel has its own toroid power transformer and power supply) although both channels are combined in a single cabinet. Imaging is very good.
Best regards,
arensattic
(aka Aren van Waarde)
Dear all,
Here is a short (and probably final) follow-up on my posts # 12984 and 12986 in this enormous thread. I have now put my homemade Apex Audio A9 amplifier PC boards with power supply in a (recycled) cabinet (19", steel). The power supply lines run at ± 37V. I have not modified mr. Slavkovic's schematic in any way, with a reduction of the series resistors for the Z15 zeners as the only exception (see post 12984). The amp really sounds great, it sings! (as is said on the Russian Komitart site). However, I disagree with one statement made by our Russian friends - they mention that quiescent current through the power MOSFets should be set to 15 mA. In my ears, this is not correct, Iq should be set to 30 mA or a bit higher (as was also said by Mr Slavkovic). Purity of the sound is much better at the higher quiescent current, and the heatsinks don't even become lukewarm. Anyhow, this project can be strongly recommended.
My amp is a dual mono setup (each channel has its own toroid power transformer and power supply) although both channels are combined in a single cabinet. Imaging is very good.
Best regards,
arensattic
(aka Aren van Waarde)
Hi Indian members,
i have about 20-30 pcbs of attached apex preamp and psu which i want to get rid of.
only shipping and packing charges of inr 200. payment by g-pay. interested members can contact me via pm with qty required and postal address.
i have used it over a year and works well. no support for build will be provided. All values provided on sch and also on pcb..
regards
prasi
i have about 20-30 pcbs of attached apex preamp and psu which i want to get rid of.
only shipping and packing charges of inr 200. payment by g-pay. interested members can contact me via pm with qty required and postal address.
i have used it over a year and works well. no support for build will be provided. All values provided on sch and also on pcb..
regards
prasi
Attachments
English only please. Rules.
There is a pdf layout here if you know how to etch your own boards:
100W Ultimate Fidelity Amplifier
No idea if it works or not.
100W Ultimate Fidelity Amplifier
No idea if it works or not.
Oh!, i forgot to explicitly mention that pcbs are free. only shipping and handling of INR 200. within India only.
thanks
but any difference in midrange or high range?
quality and fidelity of sound is the same?
thanks i build circuit but there is a problem
without input signal and no speaker connected and no heatsink and just +/-45v supply i adjust 0.33ohm resistor voltage about 10mv but it begin rising continuously and go over 20mv and 2sc5200/2sa1943 become warm and if i didn't disconnet psu become hot.
is that normal or something is wrong in circuit?
without input signal and no speaker connected and no heatsink and just +/-45v supply i adjust 0.33ohm resistor voltage about 10mv but it begin rising continuously and go over 20mv and 2sc5200/2sa1943 become warm and if i didn't disconnet psu become hot.
is that normal or something is wrong in circuit?