Dual-intensity LED (CB22128E)

This circuit switches the brightness of the LED. We found it in an English documentation. Resistors have values that depend on the LED.

Low noise 5V source (CB21170E)
This power supply was obtained from an Electronic Design from the 90's. The circuit applies to...
Unijunction Oscillator (CB471)
These days the unijunction transistor (UJT) is not common, but IF you have one you can mount this...
1 kHz Sinusoidal Generator LM3900 (CB14192E)
We found this circuit in the 1994 Linear Applications Handbook from National Semiconductor. The...