Showing posts with label single. Show all posts
Showing posts with label single. Show all posts
Wednesday, September 24, 2014
Simple Variable Voltage Current Power Supply Circuit Using a Single FET
- For many applications the requirements are not that stringent and a simple, discretely constructed regulator as described here will suffice.
- The current limiting components can then be left out.
- With values as shown, the output I voltage is 12V and the output current is limited to 0.5 A. For applications not requiring current limiting the circuit can supply up to 1 A.
- The relation between input voltage, load resistance and regulated output voltage is shown in table 1.
- This table can therefore be used to determine whether the regulation for a particular application is sufficient. The ’heart’ of the regulator, high power low-frequency transistor T1, l must be fitted onto an adequate heatsink. FET T3 operates as a current source with an output 3, maximum of 11 . . . 18 mA: this it limits the base current of T1, of course, but the alternative would have been a very low value resistor; ‘ or this would have resulted in large!
- The cost of high grade, regulated power supplies has dropped with the advent of modern lCs.
Sunday, August 31, 2014
Single Supply Function Generator
The schema has both square-wave and triangle-wave output. The left section is similar in function to a comparator schema that uses positive feedback for hysteresis. The inverting input is biased at one-half the Vcc voltage by resistor R4 and R5. The output is fed back to the non-inverting input of the first stage to control the frequency.
Circuit diagram :
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The amplitude of the square wave is the output swing of the first stage, which is 8V peak-to-peak. The second stage is basically an op amp integrator.
The resistor R3 is the input element and capacitor C1 is the feedback element.
The ratio R1/R2 sets the amplitude of the triangle wave, as referenced to the square-wave output. For both waveforms, the frequency of oscillation can be determined by the equation: fo= 1/4R3C1 * R2/R1
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Circuit diagram :
Single Supply Function Generator Circuit Diagram
The amplitude of the square wave is the output swing of the first stage, which is 8V peak-to-peak. The second stage is basically an op amp integrator.
The resistor R3 is the input element and capacitor C1 is the feedback element.
The ratio R1/R2 sets the amplitude of the triangle wave, as referenced to the square-wave output. For both waveforms, the frequency of oscillation can be determined by the equation: fo= 1/4R3C1 * R2/R1
The output frequency is approximately 50 Hz with the given components.
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