Hi Alex and Damir,
Do you have a BOM for the design?
Also, what is the latest schematic that goes with Alex's PCB?
Thank You.
Last edited:
This is schematic from post #91 https://www.diyaudio.com/forums/solid-state/253039-unique-cfa-120-230w-amp-10.html#post4113328
I don't have BOM as I never built this amp (I should in the future 😱), you should use the values from the schematic, I am sorry for inconvenient.
Some people built this amp or variant of it(could be found in this thread) and you can try to contact them.
BR Damir
I don't have BOM as I never built this amp (I should in the future 😱), you should use the values from the schematic, I am sorry for inconvenient.
Some people built this amp or variant of it(could be found in this thread) and you can try to contact them.
BR Damir
Last edited by a moderator:
Hi Damir. I am not very good with LTspice and wanted to sim the 200W amp in m*ltisim. I have some queries that maybe you can help me with. Schematic and zipped sim attached. I included a PDF schematic as well, as it is easier to read.
Please bear with me, although I have built several nice amps, I am not an electronics whiz 😀
- Can you let me know if I have connected the Servo correctly.
- Should R10/39 be 3k6.
- Should C9/10 be 220p.
- Should C14 have a symmetrical Cap going to the Collector of Q8.
- Have I connected the Signal Grounds correctly.
- I seem to have to use a lot of input signal (3Vp at 1 KHz) to get 200W into 8 Ohm's; have I made an obvious mistake in the schematic.
- Lastly. Can the amp drive 4 or 6 Ohm speakers.
Thanks for all the effort.
Please bear with me, although I have built several nice amps, I am not an electronics whiz 😀
- Can you let me know if I have connected the Servo correctly.
- Should R10/39 be 3k6.
- Should C9/10 be 220p.
- Should C14 have a symmetrical Cap going to the Collector of Q8.
- Have I connected the Signal Grounds correctly.
- I seem to have to use a lot of input signal (3Vp at 1 KHz) to get 200W into 8 Ohm's; have I made an obvious mistake in the schematic.
- Lastly. Can the amp drive 4 or 6 Ohm speakers.
Thanks for all the effort.
Attachments
Last edited:
Great. Thank you Damir.
Ref the Signal Grounds, I followed the Schematic in your post #36.
I'll make the changes to correct my mistakes.
Cheers.
Ref the Signal Grounds, I followed the Schematic in your post #36.
I'll make the changes to correct my mistakes.
Cheers.
Attachments
Last edited:
Because there is no BOM here are some important data:
Some resistors should have higher dissipation values, others just 0.6W/0.5W 1% metalfilm.
R10/R39 2W metaloxid 5%
R9 2W 1% metalfilm
R37 8W or more metalfilm 1% - I use parallel-serial combination of 2W resistors
output transistors emitter resistors good low impedance 5W
Capacitors used in compensation could be ceramic NP0/C0G, silver mica or polystyrene
Input cap if you use it good polypropylene
New thread on Mexmike amp here: Request
Hi mr alex. Its imposible to you that share graber file?
Your design is number1
Hi mr alex. Its imposible to you that share graber file?
Your design is number1