We found this circuit in a 1969 General Electric documentation. The circuit uses transistors of the time and the diodes in the dotted board must be mounted on the output transistor heatsinks.
Using an LDR, this Philips circuit directly activates a relay when light strikes the sensor. The...
We found this light-effect circuit with LEDs using the well-known 4017 in a 1987 documentation. All...
This driver for audio signals using the TAA435 integrated circuit was found in Philips 1968...