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.

CB15908E Photodiode Amplifier (CB15908E)
This circuit is suggested by National Semiconductor and has an excellent gain, for a photodiode as a...
Astable LED (CB12038E)
This astable multivibrator configuration causes two LEDs to alternately flash at a frequency...
High Stability Regulator (CB14162E)
The circuit shown is from National Semiconductor's Linear Applications Handbook, published in...