Alan G3XAQ, wrote about heater power supplies.
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One way to control a heater power supply is shown at
www.zianet.com/k5am/2mkw.pdf pages 6-10.
The circuits include:
Slow heater warm-up
Regulated heater operating voltage with remote sensing
Standby heater voltage control
OVP for the heater
Blower air-flow monitoring protection, with panel indicator
Panel expanded-scale heater voltmeter
Warm-up timer
Cool-down timer
73,
Mark, K5AM
www.zianet.com/k5am
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