Two-channel peak indicator (CB21975E)

This peak indicator for stereo amplifiers uses a CA3130. The 80's circuit does not need a symmetrical power supply.

High Q Band Notch Filter 741 (CB15479E)
An interesting bandwidth filter configuration suggested by Texas Instruments in its Linear and...
TTL to TTL Interface or Shield (CB15494E)
In the figure we have a circuit that allows to interface TTL logic with TTL logic, but with total...
Programmable TTL Sequential (CB17281E)
The lighting sequence of the LEDs on this circuit, found in a 2001 documentation, is determined by the...