A14 CFA amplifier with diamond OS.
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Thank you..
I noticed this LED circuit from 555 protect? will try to add this also .
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Hi thimios, if you can wait a few days ...
There is an improved layout for the A14, but it is not yet tested. However, I will do that in the next few days.
The changes are:
- Separation from SGND and PGND
- TL071 instead TL072
- some changes in the routing
- Capacitors in the power supply voltage
- Space for small heatsinks for drivers
regards
Olaf
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olafk
Very nice board, I am not sure if it is good idea to run the high current output track just next to the input node (op-amp).
Nice and compact.
Very nice board, I am not sure if it is good idea to run the high current output track just next to the input node (op-amp).
Nice and compact.
Hi, yes, that could be a problem. In the first layout, I have found nothing. But I'll see it 🙂.
Maybe someone else has built the A14 and can report ?
regards
Olaf
Yes i will wait for a better pcb.I agree that strong signals must be away from small signals in pcb .
Take your time.
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APEX OP LINE PREAMP.
Sir Apex pls. check if this is right Sir ? and can i use this in AX14 amp. sir
Sir Apex pls. check if this is right Sir ? and can i use this in AX14 amp. sir
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You can also use less than 2k2 series resistor at the input, or try some other combination like 100R and original 330pF, etc
Sir, Apex pls. help me to identify which pot. pins is mistake thank you Sir.
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A9 is the king!
I am not sure where to post it but I will take a chance and post the resaults here.
I have spend plenty of time with A9 based amp, lot of listening tests, measurements, swapping the resistors over and over (I only have to match VAS load resistors - I do not know exacly how to calculate them). The key was to find proper ratio (gain) in fallowing stages. I was recalculating bias in all stages with differed ratios + splitted NFB values and the bellow setup gave me the best resaults - H2 is dominating all the way threw audio band and the harmonics spectrum is very flat, amp sound superb.
Simple suff can sound and perform very well. Bellow prototype board and schematic.
Highly recommended!
Thanks Mile.
Regards
I am not sure where to post it but I will take a chance and post the resaults here.
I have spend plenty of time with A9 based amp, lot of listening tests, measurements, swapping the resistors over and over (I only have to match VAS load resistors - I do not know exacly how to calculate them). The key was to find proper ratio (gain) in fallowing stages. I was recalculating bias in all stages with differed ratios + splitted NFB values and the bellow setup gave me the best resaults - H2 is dominating all the way threw audio band and the harmonics spectrum is very flat, amp sound superb.
Simple suff can sound and perform very well. Bellow prototype board and schematic.
Highly recommended!
Thanks Mile.
Regards
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