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Old 15th January 2012, 11:33 AM   #41
44250 is offline 44250  Serbia
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A-class PSU,used in Clepsidra preamplifier:
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Old 9th February 2013, 03:44 PM   #42
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hi apex,

any replacement for bc560c for "A Class PSU"

regards,
coolet
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Old 9th February 2013, 04:22 PM   #43
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hi apex,

any replacement for bc560c for "A Class PSU"

regards,
coolet
You can use BC557, BC556...
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Old 20th February 2013, 01:01 PM   #44
mihailo is offline mihailo  Serbia
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PSU2 [1280x768].JPG

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My Apex 2x15V 1A PSU for preamp. Change 1k resistor on PSU, with 4K7 trim. pot. and you can set voltage like in Apex PSU A class. I get +/-14.70V with ZD15V.

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Old 20th February 2013, 01:05 PM   #45
mihailo is offline mihailo  Serbia
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Apex stereo preamp.
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Old 24th April 2013, 05:41 PM   #46
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Default Shunt +/-18V

Simple Shunt PSU for Preamps
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Old 2nd June 2013, 11:46 AM   #47
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The shunt regulator has a practical advantage over the serial where the short circuit protection on the output needed to provide additional circuit here she gets gratis from the working principle of the regulator.
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Old 15th June 2013, 10:01 AM   #48
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Quote:
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PSU for preamps with Serial Regulator.
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PCB for +/-15V PSU
Dear Apex,

1. As I see, the two 10R resistors after 4700uFd at post #22 has been labelled as 22R 1 Watt in the PCB Layout design at post #23.

Which one should I use?


2. Are all other resistors quarter watt in the circuit?
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Old 15th June 2013, 11:22 AM   #49
AndrewT is offline AndrewT  Scotland
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Csom the 22r or 10r have only 650mV across them.
Pd ~ 0.65^2 / 10r = 42mW, 22r is Pd=19mW

That's ~ 7% of the rating of a standard 600mW resistor.
You could 400mW or 500mW here.
If you have W as your standard stock, then use them.
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Old 15th June 2013, 11:36 AM   #50
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Csom the 22r or 10r have only 650mV across them.
Pd ~ 0.65^2 / 10r = 42mW, 22r is Pd=19mW

That's ~ 7% of the rating of a standard 600mW resistor.
You could 400mW or 500mW here.
If you have W as your standard stock, then use them.

Thank you sir for your kind reply. I will follow your words.

Pardon my ignorance but could you kindly tell me what are the advantages of this circuit over that using 7815 and 7915 in a preamp section made with opamp like TLO72 or TLO74?
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