Accurate Analogue Frequency Meter Circuit

To measure frequency one does not  immediately have to ‘go digital’. The analogue approach will invariably prove simpler and cheaper, in particular when  the analogue readout (the multimeter)  is already to hand. All that is needed is n a plug-in device, a ‘trans1ator’, that will give the meter an input it can ‘under stand’. This […]

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Simple LED Voltmeter Circuit

This simple LED voltmeter circuit, although simple, is capable of accurate voltage measurement. The input is applied to the high impedance input of lC1 via the attenuator comprising of R1 to R5 inclusive. Since this IC is used as a unity gain buffer, the output at pin 6 is equal to the input voltage at […]

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Recording Level Meter Circuit

The circuit shows a two—stage voltage amplifier driving a recording level meter. The AC signal input is amplified, rectified, and the resultant DC voltage shown on the meter. The circuit can be used with a tape recorder or audio mixer and should be fed from a point early in the pre-amp. Current consumption in a […]

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Simple Transistor Tester Circuit

The circuit used in making simple Transistor Tester Combo-2 has only one IC. This IC performs the following process as mentioned below: Test Process1: Position the transistor to the three circuit terminals of Circuit 1 (located either below of left of the terminal). Once pointed, the red LED can then identify the PNP transistor base. This […]

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