Found in 1967 Raytheon documentation, this circuit uses a company coupler consisting of a lamp and an LDR. The transistor is according to the load current.
We found this transmitter in 1980s documentation. Coil data is found next to the diagram and...
The 4528 is a dual-retriggerable monostable that needs only the timing network formed by R and C...
This circuit for analog TV was found in a 90s EDN. The integrated circuits used are from that time...