The movement of the LEDs in this circuit mimics the back-and-forth movement of a pendulum, making it suitable for clock projects. The circuit is from a Radio Electronics magazine from May 1978.
We found this circuit in a Radio Electronics from the 90s. The circuit is for conventional analog...
The operational of this amplifier can be the 741 and the resistors R1 and R3 are of 10 k. R2B is...
I found this circuit in a Popular Electronics from November 1999. The magazine is no longer...