Crystal converter (CB7327E)

This circuit was found in a Popular Electronics from the 90's. The circuit can be used to convert signals to frequencies up to 25 MHz.

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LED Constant Current Source (CB12062E)
This circuit provides a constant current of 1 mA, stabilized by an LED, which can be equivalent to that...
3 transistor receiver (CB20578E)
This receiver for the mid-wave band was found in a documentation from the 60's. The transistors are made...
Positive to negative CMOS converter (CB8854E)
This circuit converts a positive CMOS supply voltage to a negative one. We found it in a 90s...