This circuit was obtained in a Electronics World of 1968. The transistors can be equivalent as the BC558 for the PNP and the BD135 for the NPN powering lamps from 3 to 12 V according to the supply.
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...