This circuit was found in an 80's EDN. The circuit uses a current common CMOS, the 4093 powering an LED. Trigger adjustment is done in a trimpot.
This circuit was found in 1967 Philips documentation. It uses transistors from that time....
Output stages driving relays or other loads are plugged to the outputs of a 4017. The trigger...
This is a amplifier for XTAL high impedance earphones or piezoelectric types. Current drain is...