This old fashioned transistor amplifier was found in a publication of the year 1958. Transformer are the critical components in the circuit and power comes from 6 D cells.
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...