Opto control for triac (CB20552E)

Found a documentation for PC from 1992, this circuit is indicated for the English power grid of 240 V.

a High Impedance Bridge Amplifier LM1556 (CB4487E)
This circuit is from the 1993 Motorola Linear Interface ICs. The circuit must use symmetrical power...
IR Remote Control (CB24985E)
This is the transmitter for a remote-control system published in the August 1986 issue of Radio...
Small siren (CB21235E)
Found in an American documentation from the 90s, this circuit makes use of an output transformer for...