This circuit was found in a 73 magazine for radio amateurs of the 90s. The circuit uses two types of indicators, the diodes are for general use. The power supply is 5 V.
This is a common crystal oscillator configuration with 80s transistors. The circuit has the...
We found this circuit in an old American operational Amp. documentation. The circuit applies to...
The circuit shown is a constant current source which allows the reading of resistors on a very low...