This 1965 circuit uses a Philips 4068 tube to measure extremely small charges. The circuit has as indicator a micro ammeter and the transistors are of the time.
This circuit shown in the figure produces a pulse of constant duration at its output, of the order...
Silicon Labs CSP Package EFM32™ Leopard Gecko 32-Bit MCUs are part of the world's most energy...
This circuit was suggested by Philips in an old publication. The coils, made with wire 14 to 16...