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69.71.1.1
In Reply to: RE: schematic question posted by genelex on November 09, 2014 at 12:22:38
It's a positive series regulator ripple filter. It's not very sophisticated.
"...the fool doth think he is wise but the wise man knows himself to be nothing but a fool." Will Shakespeare
Follow Ups:
...by attaching a zener diode at the junction of the base of that NPN pass transistor. The zener would be in parallel with the 4700uf-25v E cap. The value of this cap controls turn on time. The zener diode should be .7v less than the desired output voltage and there is no indication of what the desired output filament voltage is. This is a very BRITISH schematic. The filament supply diode bridge is not fully drawn. There is no wiring diagram/schematic (series-parallel??) of the filament wiring. He is applying a DC bias to the filaments and raises them above ground. Moe
"...the fool doth think he is wise but the wise man knows himself to be nothing but a fool." Will Shakespeare
http://www.next.gr/circuits/Schematics-Low-Ripple-Power-Supply-l36371.html
Here the voltage reference zener diode is 1.2v less than the output voltage because we are dealing with two npn junction or two transistors.
"...the fool doth think he is wise but the wise man knows himself to be nothing but a fool." Will Shakespeare
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