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 […]
Flashlight Controlled Remote Control Switch Circuit
This flashlight remote control circuit can be used to switch ON/OFF any electrical device from a distance by pointing an illuminated flashlight towards the device. It is sometimes very annoying […]
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 IC1 via the attenuator comprising of R1 […]
Simple Logarithmic Amplifier Circuit
This logarithm amplifier circuit provides an output voltage that is equivalent to the logarithm of applied input voltage. The performance of the logarithmic operational amplifier, the circuit diagram of which […]
Constant Volume FET Amplifier Circuit
In numerous occasions it is desirable to obtain an amplifier that gives an output signal of constant amplitude for numerous input signal levels and with the very least distortion. A […]
Stereo Hi-Fi Headphone Amplifier Circuit
This circuit can be used with a stereo headphone for amplifying a low level input signal into a sufficiently high output signal in the headphone. The circuit diagram of the […]