Slight Progress on the Low IF Oscillator Circuit

Remembering this post:

https://wb9kzy.blogspot.com/2025/01/low-if-oscillator-circuit.html

I did buy some LF353 op amps as specified in the QEX 1991 article by W6IOJ.  So I swapped out the TL062 for the brand new TI LF353 chip:

LF353 op amp

TL062 op amp

Not that much different, about 6 volts peak to peak, slightly higher frequency.  But the circuit still needs some tweaking, adjustments are touchy.

 

Update: found the old dual op amp standby, the NE5532, tried in the osc:

NE5532

Slightly higher output and frequency, still very touchy to adjust.

 

Another update: tried a TLC2272 op amp which is supposed to be rail-to-rail:

TLC2272

The amplitude is now 8 volts peak to peak although the frequency is a little lower.

More on this in the future !

Best Regards,
Chuck, WB9KZY
http://wb9kzy.com/ham.htm