I'll try to keep this short (again).
I'm in the process of trying to design a circuit for use by mobile HF
operators to assist them with remotely tuning their antennas from the
driver's seat.
The circuit I _was_ going to use requires a couple LM-358 Dual OpAmps
and a single 74LS629 dual VCO.
Unfortunately, the 74LS629 is becoming very difficult to find in
small quantities. DigiKey wants me to buy 50 of 'em at $2+ each, and
Mouser doesn't carry them at all. Fortunately, I CAN find the LM-358
at DigiKey, but I usually don't have enough of an order to make their
$25 minimum (without a handling fee).
Anyway, I'm looking for a possible substitution for the 74LS629 Dual
VCO IC. Either another IC or possible a discrete-component circuit
for the VCO which will have to run in the audible hearing range. I'd
prefer to use an IC VCO if possible however.
If anyone might have some suggestions for a possible substitute for
the 74LS629, or a suitable discrete-component VCO, I'd love to hear
from you (DIRECT to my e-mail, please).
Thanks,
73,
Tom Hammond N0SS
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