This current boosting circuit uses an op-amp and 3 transistors. The current depends on Q1. The circuit is from the 1995 Encyclopedia of Electronic Circuits Volume 5.
The assembly of this amplifier was described in an article in the magazine Radio Electronics from...
Mouser Electronics offers a vibration sensor which is considered the smallest in its class. This...
This circuit was found in a documentation by A. Fanzeres making use of a grounded metal housing...