HiAPEX AA14
Hello sasa1959,
here are files for apex aa14.
here are prasi´s excellent documents:
Question.
just 2,2µF for C13, C12 ? is for the rail voltage.
Why ?
it is 3,5 pitch and 8mm diameter...so a 100µF/35V can fit
anybody has tested this amp?
kr
chris
Hy again.
here is the schematic..:
AA14 schematic
I guess nobody build this AA14. so my question regarding caps.
because of avoiding some bad influence because of wrong caps - maybe too big capacitance i kindly aks:
C6, C9 could be bigger if they fit in, Audi caps ...right?
C3, C7, C12, C13, are 22µF/25V minimum because of the rail...bigger ok?
Which would you choose?
thanks
chris
here is the schematic..:
AA14 schematic
I guess nobody build this AA14. so my question regarding caps.
because of avoiding some bad influence because of wrong caps - maybe too big capacitance i kindly aks:
C6, C9 could be bigger if they fit in, Audi caps ...right?
C3, C7, C12, C13, are 22µF/25V minimum because of the rail...bigger ok?
Which would you choose?
thanks
chris
APEX TB3
Attachments
Hello Chris,Hi
here are prasi´s excellent documents:
Question.
just 2,2µF for C13, C12 ? is for the rail voltage.
Why ?
it is 3,5 pitch and 8mm diameter...so a 100µF/35V can fit
anybody has tested this amp?
kr
chris
Those are decoupleing caps, you can have any value, say 47uF 50V might also fit there.
I dont visit too often here, so sorry for the late reply.
regards
prasi
Looks pretty similar to Evens Audio Speaker Protector PT-230A .View attachment 1217676 i found this protection pcb in old box but i dont have top parts layout....pls help me if anybody recognise this pcb please post its top parts layout...
Thank you
No tested yet
which circuit itsMy new 120w pcb
How much bias recommend as A class amplifier .A40
CFA amplifier with advance output stage.
You will need a 35-40 Vac (dual or center tap) transformer. Will get you about 50-55 Vdc and provide close to 100 watts at 8- ohm. If you are asking about 4-ohm load, then step down to a 30-35 Vac toroidal. You are currently getting about 45% efficiency from your PSU, may need to increase capacitance or most likely go to a 7-10A transformer for that current load.
I would look for the AX14 (2-pr BJTs) or the FH11/12 (2-pr mosfet) - with 3-ohm load you will need 2-pr, even with low voltage. Assuming 60% efficiency, the AX-14 should provide right at 50w, with the voltage drop of mosfets, the FH11/12 will likely provide closer to 40w at your 3-ohm load. I have built both and the mosfet has better low-end, but also a warmer midrange. IMO, I would go with the AX14 since there are proven easy to find PCBs and IMO easier to build and fault find if you have an issue. YMMV
Here you can order a pcb Apex-14:
https://www.pcbway.com/project/shareproject/Apex_AX_14_2.html
And here you can order Apex-17. Also a good amplifier.
https://www.pcbway.com/project/shareproject/Apex_AX17_amplifier.html
https://www.pcbway.com/project/shareproject/Apex_AX_14_2.html
And here you can order Apex-17. Also a good amplifier.
https://www.pcbway.com/project/shareproject/Apex_AX17_amplifier.html
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