This circuit was found in a 1969 Mullard documentation. Used transistors can be replaced with modern equivalents. Output transistors may be BD135 and 136 with heatsinks.
Supplied in a 2005 Linear Technology Application Manual, this circuit monitors the charge and...
The transducer used in this configuration that appears elsewhere on this site is a piezoelectric...
The figure shows how to use a CMOS amplifier as a crystal-controlled oscillator. The circuit is...