ECG amplifier circuit using ic 741 Schematic Circuit Diagram

Instrumentation amplifier using an opamp An instrumentation amplifier is a kind of differential amplifier with additional input buffer stages. The addition of input buffer stages makes it easy to match (impedance matching) the amplifier with the preceding stage. Instrumentation is commonly used in industrial test and measurement application. The instrumentation amplifier also has some useful[…]

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4-digit counter module

This compact four-digit digital counter is suitable for any application, such as clocks, frequency meters, digital voltmeter, tachometers, stop-watches, scoreboards, etc. The counter module provides a reset switch and a carry output signal. The maximum count of the module depends on which version of the IC used: • the MM74C926 pulls its carry output high when[…]

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Frequency probe

The frequency probe enables ”listening in’ to the speed of a computer. It is, however, also suitable for use with other digital circuits because it makes high frequency audible so that signal can be conveniently monitored. A 12-bit counter serves as a frequency detector. The signal measured in a computer or digital circuit is divided by 1024[…]

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Special band-stop filter

Special band-stop filter: Double T filters are used in many 11 circuits. This type of filter can be made into a perfect band-stop filter, at least in theory. In the present circuit (Fig. 1), a double T filter is used in a different manner. It can have the characteristic of the combination of either a[…]

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