Re: Current Transformer thanks

"Does Mr Bowden means to say pin 1 instead of pin 7 in the above
statement. Since pin 7 does not connect to a capacitor.
Or is my ignorance showing.
I'm also confused does this circuit produces 12 Volts DC ??
Is the theory of relay to turn on say a light or something when it
detects voltage? I'm probably not going to make the circuit but just
trying to understand it a bit."
____________________________________
Re;
I think you're right. It is OP amp A that does the "detecting" or
amplifying of the current signal. The signal is then integrated and
filtered at it's output; namely pin 1; by the 10uF cap paralleled by the
100k bleeder resistor. OP amp B then acts as a "switch" or comparator,
to activate the relay through the 2N3053 buffer transistor.
The relay is activate when current of sufficient magnitude passes
through a wire "monitored" by L1.
I did note that the article said that the relay may chatter when
monitored current is near the setpoint of OP amp B. This could be
remedied by inserting some hysteresis into OP amp B (the comparator);
something the circuit woefully lacks. I hope that helps...

-Dan Akers

.

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