Remote control tester (CB7823E)

This circuit from a 90s Electronics Now, uses a 4010 gate as a signal amplifier. The circuit triggers an indicator LED.

100 kHz CMOS Oscillator (CB9502E)
This 100 kHz crystal oscillator uses 7404 to generate square signals. We found it in a Popular...
UCN4202 Stepper Motor Control (CB17557E)
This circuit can be used as a shield for the control of stepper motors from microcontrollers. The...
2-meter band preamplifier (CB20242E)
This circuit uses a double MOSFET, a component not very easy to obtain today. The circuit is from...