Found in a 90s R-E Experimenters Handbook, this circuit amplifies signals from 100 Hz to 3 MHz. The circuit has a gain of approximately 30 dB. Bipolar transistors are general-purpose types.
This circuit using 2N2904 general purpose transistors is from a December 1993 Electronics Now...
This shield was found in the June 1995 Electronics Now magazine. The circuit uses a low-power...
This circuit was taken from a Popular Electronics from the 90's. The power step can be changed to...