This circuit was obtained in the 1990 Motorola Linear Databook. The circuit uses a 139 series comparator, but other series can be used. The power source need not be symmetric.
January 2017 - Now available on Mouser Electronics, Texas Instruments' new LDC2114EVM Evaluation Module...
This circuit is better than the previous one in that the control is isolated by a transformer. The...
Found on a Radio Electronics, but also on other sources and placed elsewhere in this section, this low...