PCB toner transfer files are attachedmay be someone will make to sing ....
Regards ,Alex
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.
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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
Some people built this amp or variant of it(could be found in this thread) and you can try to contact them.
BR Damir
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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![Big grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
- 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
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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
- 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.
Just realised Q21, Q22, Q2. All Collector and Emitters wired in reverse; wonder what else I've gotten wrong!!!![]()
Seems to work now. Signal Grounds placed as described by Damir. m*ltisim file attached. Sim models updated. Hope it is good now.
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
Request
Hi mr alex. Its imposible to you that share graber file?
Your design is number1
I have check again ,found only one bad connection ,corrected now ,and I think are no more errors IMHOso we can move ahead.....
Alex
Hi mr alex. Its imposible to you that share graber file?
Your design is number1
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