Quote:
Originally posted by wa2ise
I'd use resistors around 5 to 10 ohms. It's a little hard to calculate the desired ohmage when working with a half wave rectifier with filter caps circuit. Most of the time the rectifier diode is not conducting. It does conduct for a brief period of time at the top of the AC waveform, to top off the filter cap. That makes for a relatively large current spike. This spike is about 20 times larger than the B+ current draw by the rest of the set from its power supply. A rough guess for that current would be around 200ma. Twenty times that comes out to 4 amps. and to lose 20V would mean a 5 ohm power resistor. 300 ohms aint gonna curt it
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You were right,
5 ohm / 5 watt resistors with the diodes work perfectly, The old seleniums are disconnected now. The current is 240ma according to the Sam's folder so the 5 ohm resistor is right on. Thanks again.
Jim
04-16-2004, 08:57 PM
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