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Old 16th December 2013, 08:30 PM   #81
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Quote:
Originally Posted by desertstorm View Post
Sir Apex here is my on going projects...thanks and regards.
Nice work
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Old 17th December 2013, 03:46 AM   #82
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thank you so much sir Apex...
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Old 17th December 2013, 05:22 AM   #83
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Quote:
Originally Posted by maouna View Post
Mr Mile do you have PCB for these preamplifiers?
No coupling caps at in/outputs with the BJT version. Don't connect this one to a DC coupled power amp.

No GND reference resistors with the FET version so large plops when connecting it to a power amp. Schematics seem to be that of prototype versions.
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Old 6th February 2014, 09:10 AM   #84
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Default BJT Preamplifier - A Class PSU

Hello Mr Miles!

I plan to make your preamplifier with your "A class PSU" but I have a few questions before I start.

- The version of the preamplifier (bjt) it can be supplied with +-15V?
- This preamplifier can it be preceded by your (bjt) buffer or is it stupid?

Thank you and friendly!
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Old 21st February 2014, 10:02 AM   #85
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Hello Mr. Miles!

I draw a circuit to supply this and here are some images.
When my realization is complete and if everything is ok I will move my version of the circuit in pdf format.

Thank you and friendly!
Attached Images
File Type: png A-Class PSU.png (87.6 KB, 233 views)
File Type: png A-Class PSU_Top.png (50.2 KB, 225 views)
File Type: png A-Class PSU_Bot.png (48.9 KB, 216 views)
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Old 21st February 2014, 10:47 AM   #86
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Quote:
Originally Posted by Project16 View Post
Hello Mr. Miles!

I draw a circuit to supply this and here are some images.
When my realization is complete and if everything is ok I will move my version of the circuit in pdf format.

Thank you and friendly!
Nice work,
Regards
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Old 21st February 2014, 03:22 PM   #87
udailey is offline udailey  United States
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Quote:
Originally Posted by apexaudio View Post
VR 1k must be replaced with 4k7 for BF245A, and regulation output voltage will be from +/12V to +/-24V.
Apex
I found BD245B. Anything I need to change or is this okay for the psu?
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Old 22nd February 2014, 11:41 AM   #88
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Hello Mr. Miles

A small question!
For resistors 22R (BD241 - BD242 collector) It takes 1W or 1/2W may agree?

Thank you!
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Old 23rd February 2014, 03:57 PM   #89
Ryssen is offline Ryssen  Sweden
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How much current can the PSU leave?
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Old 23rd February 2014, 04:14 PM   #90
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24 x 1.414 = 33.94V more than enough headroom for a regulator.
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