This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz to 100 kHz and modern equivalent components can be used. The circuit is from Ferranti.
This circuit is suggested by Texas Instruments in his Optoelectronics Sourcebook. Any photo...
This circuit provides a high intensity pulsating signal to a speaker. The circuit is from an...
The 4511 is a 7-segment latch driver providing up to 25 mA in each output. The typical application using the...