IC 74121 PDF

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A quartz crystal oscillator circuit that can generates kHz iic with a 3-stage decade counter can be used as a reference frequency source see the Figure 2. The Diodes used in the circuit are 1N or equivalent. The first chart works for either 74211 74L or 74L; however, the second chart only applies to the 74L The pulse width produced by the monostable multivibrator depends on the values of capacitors C The shown above provides a single Monostable Multivibrator function.

The pulse voltage is proportional to the input frequency, through the diode VD5 this voltage charges the capacitor C1. Reference oscillator circuit diagram. While the shown below provides a retriggerable Monostable Multivibrator function with clear. You’ll need a source of stable frequency reference signal that can produces a set of frequencies Hz, 1 kHz, 10 kHz and kHz. The load Capacitance CL is 50pF, including scope probe, wiring, and any stray capacitance. VD4 protects the integrated circuit from overloading.


Also refer to Transistor Multivibrator Circuits. Do the same operation for all ranges. C5 and trimming potentiometers R There are two different methods of connecting Rx and Cx.

The circuit could be used for any TTL family, such as LS, or H, but the load capacitor might need to be changed to reflect that. The number of frequency ranges can be increased by using a rotary switch SA1 with more than four positions, and by adding some additional RC components. All this allows to create very simple frequency meter 7411 with several frequency ranges: The first method for a Cx of less than 7411 [below] and a second connection [below that] for an external capacitor, Cx, of greater than pF.

A Monostable Multivibrator is also called a One Shot.

Frequency meter with 74121 monostable multivibrator

The pin out diagram works any any style 74xx or 74xx DIP chip, but the timing graphs are only valid for the TTL families indicated. Instead ofthe SN or DM can be used. All 47121 allows to create very simple frequency meter circuit with several frequency ranges:. The device can measure sinusoidal wave and square wave input signals.

or Timer as a One-Shot

To use the internal timing resistor connect Rint to Vcc. 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.


Note the uses a 4k internal resistor, while the uses a 20k resistor. The Figure 1 shows the circuit diagram of the frequency meter, the circuit based on the digital IC The pulse frequency depends on the input frequency.

Electronic Engineering Dictionary

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. The ammeter PA1 indicates the voltage across the capacitor C1. Digital integrated circuits can be used in the design of an analogue frequency meter with a frequency range to several MHz. Adjust the trimming potentiometer R3 to move the 741221 of ammeter PA1 to the maximum value on the scale.

This device uses the ammeter with full-scale deflection of 0. How to calibrate this frequency meter? 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.

Frequency meter with monostable multivibrator

The two graphs below show the resultant pulse width for different values of resistors and capacitors. By the way, the ammeter PA1 can be replaced with a digital multimeter.

How to Read Logic Truth Tables: