Hello Wendell,
take a look at Greg Erskine's Web Site:
Greg's Web Site
and take the values of the DX PSU, Carlos designed.
The values are:
R1,R3: the "Bleeders" - 2K2/2W (do not populate R2,R4 or use 4K7 / 2W for R1 - R4)
R5,R6: Leds' resistors: 6K8/0.25W
R7,C17 and R8,C18: PSU filter: 0R47/1W / 1n5
Instead of using thermistors ICL1 and ICL2 use "damping resistors" 3R3 / 3W with enamelled copper wire wound around them.
Best regards - Rudi_Ratlos
take a look at Greg Erskine's Web Site:
Greg's Web Site
and take the values of the DX PSU, Carlos designed.
The values are:
R1,R3: the "Bleeders" - 2K2/2W (do not populate R2,R4 or use 4K7 / 2W for R1 - R4)
R5,R6: Leds' resistors: 6K8/0.25W
R7,C17 and R8,C18: PSU filter: 0R47/1W / 1n5
Instead of using thermistors ICL1 and ICL2 use "damping resistors" 3R3 / 3W with enamelled copper wire wound around them.
Best regards - Rudi_Ratlos
...
Amp is looking good Meanman. ...
But I do not like regulated PSUs in an AMP.
The reasons for this are:
- the regulated PSU is expensive
- there is normally no need to adjust the output voltage in case you have "correct" transformers
- the TIP42 transistors use a lot of power for themselves
- Doesn't a regulated PSU slow down the dynamics of an AMP?
Best regards - Rudi_Ratlos
P.S. But since I know you had it at your hands: use it!
Amp is looking good Meanman. ...
But I do not like regulated PSUs in an AMP.
The reasons for this are:
- the regulated PSU is expensive
- there is normally no need to adjust the output voltage in case you have "correct" transformers
- the TIP42 transistors use a lot of power for themselves
- Doesn't a regulated PSU slow down the dynamics of an AMP?
Best regards - Rudi_Ratlos
P.S. But since I know you had it at your hands: use it!
Regulated psu's are good for the voltage amp/input pair/ccs section of the amp. Better to run the OP pairs off of the "dirty" unregulated supply.
Same goes for the grounds. Have 2 of them , One for large rail caps and zobel , and a dedicated "clean" one for any voltage amp cascode/input pair CCS or DC blocking/input RC filter.
Not to be critical of the beautiful layouts
I see a few posts back , BUT .. the large reservoir caps on the amp board will inject tremendous "dirty" charging pulses into the local star.OS
The reason I use this regulator is that my two 2x24Vac/160VA toroids ain't strong enough did some testing about that.The only outcome was a supply of 2x28Vac/160VA this gave a very strong nice sounding amp a supply of 2x25Vac/160VA was even better than the 24V toroid but I sence that the 160VA still wasn't enough.I'm planning to use a 2x30Vac/500VA toroid for both channels with the regulator adjusted under load.With the 2x28V supply and rectified I had between 37Vdc and 40Vdc when playing music and the sound was amazing that could also be an option to use 28Vac supply.Rudi I don't know if you visit the Thel website there you can read that the regulator is made specialy for amps.Test results will follow.
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This is a finished amplifier channel board (kit prototype):
An externally hosted image should be here but it was not working when we last tested it.
Easy...
They will ease your pain, give yourself a try.
Only good thoughts don´t do the whole job.
It is good you are back.
Why don´t you try the place I sent you the address (by mail) some time ago?
They will ease your pain, give yourself a try.
Only good thoughts don´t do the whole job.
It is good you are back.
Carlos,
Relax... it's temporary.
In the next days my wife will be in the hospital, too. My second son is coming...
Best Regards.
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