This circuit that has a response from 10 Hz to 700 kHz was found in Philips documentation from 1968. Dual transistors can be replaced by matched pairs.
Ideal for benchtop use, this dual-band circuit was obtained from the 1995 Electronics Now...
This circuit was found in a Popular Electronics from the 80's. The circuit can be applied to any...
This circuit was found in a PE Hobbyst Handbook of 1989. It uses a black light fluorescent of the time....