Suggested by Amperex in 1968, this circuit is intended for hearing aids. The integrated circuit used, a TAA370 is not common today.
The circuit used is the 4093 configured as an inverter in this application from Radio Electronics from...
We find this circuit in a 1977 technical documentation. The circuit generates signals in a wide...
In the figure we have a way to obtain a 15 V symmetrical source with a 30 V single winding...