Gain 10 Voltage Amplifier (T456E)

This 4-stage circuit has a voltage gain of 10 and negative feedback. The circuit was found in an old MIT publication.

Pre-Emphasis on 1500 Hz (CB13685E)
This circuit reinforces signals in a frequency range between 1500 and 2000 Hz for use in...
Wind Detector (CB5155E)
When a small air current reaches the piezoelectric sensor, a small audio signal is generated and...
Signal Injector (CB10325E)
This circuit is from a Poptronics, American magazine from August 2000. The circuit can be...