LM3900 Positive Differentiator (CB5054E)

The circuit shown in the figure has an output voltage rise time of 0.22 ms and an input time constant of approximately 1 ms.

Code practice oscillator (CB8697E)
This circuit was found in a 90s Wels' Think Tank. The frequency depends on C2 and R3. The handset...
LM3900 Voltage Controlled Oscillator (CB14198E)
The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. The...
Zero Crossing Switch (CB15063E)
This zero-crossing switch circuit triggers an SCR when the input voltage goes through zero. The...