741 Filter (CB24265E)

The 1 kHz tuned filter shown uses a 741 op-amp. The components can be re-scaled to suit the desired frequency.

Bistable Power Switch with Memory (CB18046E)
The purpose of this circuit is to connect an appliance (fan, lamp, motor, soldering iron, etc.) or an...
300 to 3,000 Hz Speech Filter (CB6543E)
Found on an 80's Radio Electronics, this two-section circuit is designed to pass the frequency...
NC Power Relay (CB14816E)
This power step for relay activation was found in the 1964 RCA transistors manual. The circuit is of the...