Simplistic Mosfet HV Shunt Regs - Page 425 - diyAudio
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Old 25th October 2013, 10:04 AM   #4241
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Old 25th October 2013, 01:28 PM   #4242
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Old 15th December 2013, 05:28 PM   #4243
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Any changes to the circuit posted in #2061? Any part changes?

47uF before the regulator
20VDC headroom
minimum 20mA extra current
20mA (assuming minimum is used) * final B+ dissipated by Q3
Q1 dissipates (20mA + load current) * 20VDC headroom
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Old 15th December 2013, 09:06 PM   #4244
Salas is online now Salas  Greece
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No changes. Your summary is correct too.
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Old 15th December 2013, 10:24 PM   #4245
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That's quite the testament to your design! Congrats! Given a 20mA load could I get away with 15 mA - 18mA shunt current instead of the recommended 20mA?
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Old 16th December 2013, 12:42 AM   #4246
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You could, it will only be bit worse in spec, but no tragedy. Run it at even 30mA spare when you will have the sinking, the change is audible enough form 15mA.
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Old 16th December 2013, 01:38 AM   #4247
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Salas,

What changes to SSHV2 for 100V input, about 70 to 80V out?
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Old 16th December 2013, 01:44 AM   #4248
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You gotta scale down the two same value I/V resistors R9,R10.
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Old 16th December 2013, 01:47 AM   #4249
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Quote:
Originally Posted by Salas View Post
You gotta scale down the two same value I/V resistors R9,R10.
Will give it a try, thanks!
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Old 16th December 2013, 05:30 AM   #4250
poty is offline poty  Russian Federation
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Quote:
Originally Posted by luvdunhill View Post
minimum 20mA extra current
20mA (assuming minimum is used) * final B+ dissipated by Q3
I see this confusing...
20mA extra current is above MAX (amplitude) current, not quiescent current, so the dissipation for Q3 should be (20mA -5mA +(Imax - Io))*Vb+,
where
Imax - amplitude current
Io - quiescent current
Vb+ - final B+
5mA - this current is reserved by BJT cascode and sensing circuit.

Last edited by poty; 16th December 2013 at 05:39 AM.
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