Reply to "PS1 smoke unit"

stan2004OGR Forum Member

Whoa! Are you applying power or voltage directly to the heater resistors? If so, I implore you to cease and desist!

As GRJ suggests above, if you want to see if the circuit is operating as intended you can ramp up the AC voltage input while measuring the DC voltage across each resistor. At low AC input voltage there will be little if any DC voltage across the resistor attached to the 772 transistor; this is because the 772 is "ON" effectively shorting the resistor. At high AC input voltage the 772 transistor turns "OFF" allowing DC voltage across the resistor. When this happens both heater resistors are active with each dropping 1/2 of the available DC voltage from the bridge rectifier.

12/27/1511:01 PM

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