IC 74121 PDF

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By the way, the ammeter PA1 can be replaced with a digital multimeter. The pulse width produced by the monostable multivibrator depends on the values of capacitors C A quartz crystal oscillator circuit that can generates kHz signal with a 3-stage decade counter can be used as a reference frequency source see the Figure 2. Note the uses a 4k internal resistor, while uc uses a 20k resistor.

Also refer to Transistor Multivibrator Circuits. All this allows to create very simple frequency meter circuit with several frequency ranges: The shown above provides a single Monostable Multivibrator function.

There are two different methods of connecting Rx and Cx.

Frequency meter with monostable multivibrator

How to Read Logic Truth Tables: The ammeter PA1 indicates the voltage across the capacitor C1. Reference oscillator circuit diagram. Do the same operation for all ranges.

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The first chart works for either the 74L or 74L; however, the second chart only applies to the 74L You’ll need a source of stable frequency reference signal that can produces a set of frequencies Hz, 1 kHz, 10 kHz and kHz. All this allows to create very simple frequency meter circuit with several frequency ranges:.

C5 and trimming potentiometers R A Monostable Multivibrator is also called a One Shot.

Turn the rotary switch S1 of the frequency meter to the range of Hz and connect the device to the reference signal source of Hz. The Figure 1 shows the circuit diagram of the frequency meter, the circuit based on the digital IC The pulse voltage is proportional to the input frequency, through the diode VD5 this voltage charges the capacitor C1.

The two graphs below show the resultant pulse width for different values of i and capacitors. The load Capacitance CL is 50pF, including scope probe, wiring, and any stray capacitance.

Frequency meter with 74121 monostable multivibrator

VD4 protects the integrated circuit from overloading. The number of frequency ranges can be increased by using a rotary switch SA1 with i than four positions, and by adding some additional RC components.

How to calibrate this frequency meter? The device can measure sinusoidal wave and square wave input signals. Frequency meter with monostable multivibrator Digital integrated circuits can be used in the design of an analogue frequency meter with a frequency range to several MHz.

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This IC is the monostable multivibrator that may generate a pulse of a different width from 35 ns and wider that depends on RC components.

This device uses the ammeter with full-scale deflection of 0. The first method for a Cx of less than pF [below] and a second connection [below that] for an external capacitor, Cx, of greater than pF.

Instead ofthe SN or DM can be used. The Diodes used in the circuit are 1N or equivalent. Digital integrated circuits can be used in the design of an analogue frequency meter with a frequency range to several MHz. To use the internal timing resistor connect Rint to Vcc.

or Timer as a One-Shot

The pin out diagram works any any style 74xx or 74xx DIP 741121, but the timing graphs are only valid for the TTL families indicated.

While the shown below provides a retriggerable Monostable Multivibrator function with clear. Adjust the trimming potentiometer R3 to move the needle of ammeter PA1 to the maximum value on the scale.