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## Frequency of UJT as an oscillator Thyristor firing circuit Solution

STEP 0: Pre-Calculation Summary
Formula Used
Frequency of UJT as Oscillator = (1/((Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator))))
f = (1/((R*C)*ln(1/(1-η))))
This formula uses 1 Functions, 3 Variables
Functions Used
ln - Natural logarithm function (base e), ln(Number)
Variables Used
Resistance - Resistance is a measure of the opposition to current flow in an electrical circuit. Its S.I unit is ohm. (Measured in Ohm)
Capacitance - Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential. (Measured in Farad)
Intrinsic stand-off ratio UJT as Oscillator- Intrinsic stand-off ratio UJT as Oscillator is defined as the ratio of emitter base 1 resistance to the total emitter base junctions resistances.
STEP 1: Convert Input(s) to Base Unit
Resistance: 10 Ohm --> 10 Ohm No Conversion Required
Intrinsic stand-off ratio UJT as Oscillator: 0.5 --> No Conversion Required
STEP 2: Evaluate Formula
Substituting Input Values in Formula
f = (1/((R*C)*ln(1/(1-η)))) --> (1/((10*3)*ln(1/(1-0.5))))
Evaluating ... ...
f = 0.0480898346962988
STEP 3: Convert Result to Output's Unit
0.0480898346962988 Hertz --> No Conversion Required
0.0480898346962988 Hertz <-- Frequency of UJT as Oscillator
(Calculation completed in 00.000 seconds)

## < 10+ Thyristors Calculators

Excess work due to thyristor 1 in chopper circuit
Excess energy in chopper circuit = 0.5*Reverse di/dt limiting inductance*((Load current of chopper circuit+(Reverse recovery time*Commutation capacitor voltage)/Reverse di/dt limiting inductance)-(Load current of chopper circuit^2)) Go
Worst case steady state voltage across first thyristor in series connected thyristors
Worst case steady state voltage of thyristor 1 = ((Resultant series voltage of thyristor string+(Number of thyristors in series thyristor string-1)*Resistance*Off state current spread of thyristor string))/Number of thyristors in series thyristor string Go
Voltage across first thyristor in series-connected thyristors
Voltage across thyristor 1 in thyristor string = (Resultant series voltage of thyristor string+(Number of thyristors in series thyristor string-1)*Resistance*Off state current spread of thyristor string)/Number of thyristors in series thyristor string Go
Resultant series voltage of series connected thyristor string
Resultant series voltage of thyristor string = Number of thyristors in series thyristor string*Voltage across thyristor 1 in thyristor string-(Number of thyristors in series thyristor string-1)*Resistance*Off state current spread of thyristor string Go
Maximum Thyristor gate voltage for resistance firing circuit
Maximum gate voltage = Maximum AC input voltage*(Stabilizing Resistance/(Stabilizing Resistance+Variable Resistance+Resistance)) Go
Derating factor of series connected thyristor string
Derating factor of thyristor string = 1-(Resultant series voltage of thyristor string/(Number of thyristors in series thyristor string*Worst case steady state voltage of thyristor 1)) Go
Power dissipated by heat in SCR
Power dissipated by heat in SCR = (SCR junction temperature-SCR ambient temperature)/Thermal resistance of SCR Go
Thermal resistance of SCR
Thermal resistance of SCR = (SCR junction temperature-SCR ambient temperature)/Power dissipated by heat in SCR Go
Leakage current of the collector-base junction
Collector to base leakage current = Collector current-Common base current gain of transistor*Emitter current Go
Discharging current of dv/dt protection thyristor circuits
Discharging current of thyristor circuit = Input voltage/((Resistance+Resistance)) Go

### Frequency of UJT as an oscillator Thyristor firing circuit Formula

Frequency of UJT as Oscillator = (1/((Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator))))
f = (1/((R*C)*ln(1/(1-η))))

## What is an UJT?

The UJT or uni junction transistor is a semiconductor device that has only one junction. The UJT has three terminals designated B1, B2 and E. The base material for a UJT is a lightly doped N-Type Silicon bar with ohmic contacts given at the lengthwise ends. These end terminals are called B1 and B2. Since the silicon bar is lightly doped, the resistance between B1 and B2 is very high (typically 5 to 10 KΩ). A heavily doped P-type region is constructed on one side of the bar close to the B2 region. This heavily doped P region is called emitter and it is designated as E. Resistance between E & B1 is higher than the resistance between E & B2 because E is constructed close to B2.

## How to Calculate Frequency of UJT as an oscillator Thyristor firing circuit?

Frequency of UJT as an oscillator Thyristor firing circuit calculator uses Frequency of UJT as Oscillator = (1/((Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator)))) to calculate the Frequency of UJT as Oscillator, The Frequency of UJT as an oscillator Thyristor firing circuit formula is defined as the frequency of the UJT based relaxation oscillator at which it oscillates. Frequency of UJT as Oscillator is denoted by f symbol.

How to calculate Frequency of UJT as an oscillator Thyristor firing circuit using this online calculator? To use this online calculator for Frequency of UJT as an oscillator Thyristor firing circuit, enter Resistance (R), Capacitance (C) & Intrinsic stand-off ratio UJT as Oscillator (η) and hit the calculate button. Here is how the Frequency of UJT as an oscillator Thyristor firing circuit calculation can be explained with given input values -> 0.04809 = (1/((10*3)*ln(1/(1-0.5)))).

### FAQ

What is Frequency of UJT as an oscillator Thyristor firing circuit?
The Frequency of UJT as an oscillator Thyristor firing circuit formula is defined as the frequency of the UJT based relaxation oscillator at which it oscillates and is represented as f = (1/((R*C)*ln(1/(1-η)))) or Frequency of UJT as Oscillator = (1/((Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator)))). Resistance is a measure of the opposition to current flow in an electrical circuit. Its S.I unit is ohm, Capacitance is the ratio of the amount of electric charge stored on a conductor to a difference in electric potential & Intrinsic stand-off ratio UJT as Oscillator is defined as the ratio of emitter base 1 resistance to the total emitter base junctions resistances.
How to calculate Frequency of UJT as an oscillator Thyristor firing circuit?
The Frequency of UJT as an oscillator Thyristor firing circuit formula is defined as the frequency of the UJT based relaxation oscillator at which it oscillates is calculated using Frequency of UJT as Oscillator = (1/((Resistance*Capacitance)*ln(1/(1-Intrinsic stand-off ratio UJT as Oscillator)))). To calculate Frequency of UJT as an oscillator Thyristor firing circuit, you need Resistance (R), Capacitance (C) & Intrinsic stand-off ratio UJT as Oscillator (η). With our tool, you need to enter the respective value for Resistance, Capacitance & Intrinsic stand-off ratio UJT as Oscillator and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well. Let Others Know