The circuit in the figure uses two operational amplifiers: an LM101A and an LM102. Diodes admit equivalents and resistors do not have to be accurate. The power supply must be symmetrical.
This simple power supply, which is equivalent to 2 AAA or AA batteries, was found in an Elektor...
This is an old configuration that can be modified to operate with 5 V (use 1k on the base...
The 4007 integrated circuit consists of 4 MOSFETs that can be used separately. The figure shows how...