This circuit is from an 80's documentation, firing when the input voltage exceeds 5 V. The SCR can be the TIC106 need not have a heatsink.
This digital mixer uses CMOS integrated circuits. The circuit was published by us in a magazine...
This simple circuit with a neon lamp is from a documentation from the 70s. It indicates whether...
This fixed current source uses a Norton LM3900 amplifier. The maximum current depends on the...