This circuit is one of many that the reader can find in this section for testing crystals. The circuit uses an indicator LED. Transistor Q1 determines the maximum crystal frequency that can be tested.
January 2017 - Pulse Electronics' new current sensing insulation transformers for automotive...
The starter circuit shown in the figure was found in an old European documentation. The circuit makes...
The current of this voltage regulator depends on the transistor which can be a TIP31 for 2 or 3 A....