Found in a 1966 General Electric documentation, this dimmer should only be used with incandescent lamps. The Triac is according to the power of the lamp.
This driver for audio signals using the TAA435 integrated circuit was found in Philips 1968...
This circuit was found in the used integrated circuit manufacturer's manual. The table beside the...
This circuit produces a loud audio tone by a small loudspeaker. Power supply voltage ranges from 5...