This circuit was obtained in a Hands-On Electronics from the 90's. The circuit turns on one LED at the end of the timer, erasing the other. The timing can be increased by changing C1.
This amplifier provides a maximum power of 7 W, depending on the supply voltage. The integrated...
Found in a 90s R-E Experimenters Handbook, this circuit amplifies signals from 100 Hz to 3 MHz....
The gated oscillator in the figure bellow tums on when a “0" Iogic Ievel is applied to its input....