This is an improved circuit from the earlier version also found in the April 1972 Radio Electronics magazine. The power transistors must be provided with heat sinks.
When a small air current reaches the piezoelectric sensor, a small audio signal is generated and...
This circuit, from the 1977 GE semiconductor manual, uses a unijunction transistor beyond the...
The logarithmic response of this amplifier with operational is given by the presence of the...