This oscillator uses a small IF transformer taken from an old transistor radio. FET admits equivalents. The circuit can be used to calibrate radios.
This circuit was found in a 90s Popular Electronics. With it, using a 4066, it is possible to...
This circuit was found in a Popular Electronics from the 90s. The circuit has temperature...
In the figure we have the basic application of an LM3900 transconductance amplifier, as suggested by...