From: nobody@[EMAIL PROTECTED]
(Steve)
I have a question about a op-amp circuit.
I saw a circuit where an op-amp is driving a transistor for a voltage
regulator circuit.
There is 12-volts feeding both inputs but one input has a zener, the
other has a resistor divider, etc...; both circuits are for maintaining
a constant voltage.
The 12-volts also comes directly across through a resistor divider and
in the middle is a capacitor with the other end connected to the output
of the op-amp - which is also connected to the base of a transistor.
My questions are: what is the capacitor doing? If say the 12-volts goes
through two equal resistors (for ease of explanation) and there is
6-volts DC on one side of the capacitor, what is this doing for the
output of the op-amp?
Another words the the circuit would look like this:
op-amp output >>>>> capacitor >>>>> 6-volts (coming from resistor
divider)
base of transistor.
TIA
-----------------------------
I don't think they like to discuss this here.,
last time I saw a gate on a base the cap, if grounded, was to maintain
the frequency unchanged with regard to the source (~) if not grounded,
to filter unwant]ed - ah forget it ....
Roy Q.T. ~ US/NCU ~ E.E. Technician
[have tools, will travel]
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