The transistor used in this circuit is uncommon today. AC124 or equivalent such as AC188K and 2N2431 can be used. The circuit is from the 80's and makes use of transformers.
This circuit has a sensitivity of 2uW. We found it in documentation from the 1980s. The integrated...
The inverter circuit shown in the figure can be used to power a fluorescent lamp in an emergency...
In the figure we have an audio amplifier suitable for portable applications in both mono and...