Equivalent operational amplifiers can be used on this crystal-controlled oscillator. The circuit is from old documentation and can be changed to operate on other frequencies.
The difference between this circuit and the previous one is that it uses PNP transistors. The...
For the low channels (2 to 6) the coil is formed by 5 turns of wire 20 or 22 in a form of 1 cm...
This circuit appeared in a noverber 1962s Practical Electronics. The magazine is no more, but the...