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C5 and trimming potentiometers R To use the internal timing resistor connect Rint to Vcc. How to Read Logic Truth Tables: The first chart works for either the 74L or 74L; however, the second chart only applies to the 74L The pin out diagram works any any style 74xx or 74xx DIP chip, but the timing graphs are only icc for the TTL families indicated.
The Diodes used in the circuit are 1N or equivalent. All this allows oc create very simple frequency meter circuit with several frequency ranges:. The load Capacitance CL is 50pF, including scope probe, wiring, and any stray capacitance. VD4 protects the integrated circuit from overloading.
The first method for a Cx 74211 less than pF [below] and a second connection [below that] for an external capacitor, Cx, of greater than pF. 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 device can measure sinusoidal wave and square wave input signals. The pulse voltage is proportional to the input frequency, through the diode VD5 this voltage charges the capacitor C1. The pulse frequency depends on the input frequency. A Monostable Multivibrator is also called a One Shot.
The Figure 1 shows the circuit diagram of the frequency meter, the circuit based on the digital IC How to calibrate this frequency meter? There are two different methods of connecting Rx and Cx. While the shown below provides a retriggerable Monostable Multivibrator function with clear. Note the uses a 4k internal resistor, while the uses a 20k resistor. The ammeter PA1 indicates the voltage across the capacitor C1.
Frequency meter with 74121 monostable multivibrator
Adjust the trimming potentiometer R3 to move the needle of ammeter PA1 to the maximum value on the scale. Frequency meter with monostable multivibrator Digital integrated circuits can be used in the design of an analogue 7412 meter with a frequency range to several MHz.
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. This device uses the ammeter with full-scale deflection of 0. By the way, the ammeter PA1 can be replaced with a digital multimeter. 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
Digital integrated circuits can be used in the design of an analogue frequency meter with a frequency range to several MHz. The two graphs below show the resultant pulse width for different values of resistors and capacitors.
Do the same operation for all ranges. Kc this allows to create very simple frequency meter circuit with several frequency ranges: 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. Also refer to Transistor Multivibrator Circuits.
The shown above provides a single Monostable Multivibrator function. Turn the rotary switch S1 ci the frequency meter to the range of Hz and connect the device to the reference signal source of Hz.
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. Instead ofthe SN or DM can be used.
Reference oscillator circuit diagram. The pulse width produced by the monostable multivibrator depends on the values of capacitors C