[Elecraft] OT - Looking for an audio-range VCO

[Tom Hammond]

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