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Old 13th May 2016, 10:31 PM   #1
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Default Developing a Regulated Dual Rail Power Supply For FirstWatt Amps

Why did I choose bipolar transistors?

1) Smaller voltage drop across transistors compared with mosfets, which means less heat generated/wasted
2) A larger variety of suitably matching npn and pnp devices
3) I have a stack of bipolar transistors in my stash of parts that will probably never be used in an amp circuit.

I have not had the chance to test this circuit in the lab as yet, and would appreciate advice on improvements that aren't radical changes to the original circuit.

Here is the positive half of the circuit

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Old 13th May 2016, 10:51 PM   #2
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Default Output Impedance

Output impedance

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Old 13th May 2016, 11:04 PM   #3
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Default Power Supply Ripple Reduction

Tuned for around 100dB reduction between 100Hz and 120Hz

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Old 13th May 2016, 11:14 PM   #4
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me not likee when phase is changed

put BF245C in place of R2

ya still need TES device on output of circ
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Old 13th May 2016, 11:17 PM   #5
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Quote:
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me not likee when phase is changed

put BF245C in place of R2

ya still need TES device on output of circ
Yeah I wasn't sure about whether that would be a problem or not, but decided to use it to my advantage.

With CCS performance is flat but not as good.

I'll do a sim.
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Old 13th May 2016, 11:25 PM   #6
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Ok with J111 CCS and retuning the circuit

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Old 13th May 2016, 11:41 PM   #7
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ya still need TES device on outpout , plus Boucherot cell
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Old 14th May 2016, 12:27 AM   #8
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What is TES?
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Old 14th May 2016, 12:35 AM   #9
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Gain and feedback will lower the impedance and increase the line rejection ("ripple reduction") at DC and at low & midrange frequencies. Some people are frightened of gain and feedback.
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Old 14th May 2016, 12:53 AM   #10
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Quote:
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What is TES?
Transition-edge sensor...
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