Rf probe for vtvm


Posted on Aug 23, 2012

This circuit combines a 555 timer with a 2N2222 transistor and an external potentiometer. The pot adjusts the output voltage to the desired value. To regulate the output voltage, the 2N2222 varies the control voltage of the 555 IC, increasing or decreasing the pulse repetition rate. A 1 K resistor is used as a collector load. The transistor base is driven from the external pot. If the output voltage becomes less negative, the control voltage moves closer to ground, causing the repetition rate of the 555 to increase, which, in turn, causes the 3 µf capacitor to charge more frequently


Rf probe for vtvm
Click here to download the full size of the above Circuit.

Output voltage for the circuit is 0 to 10 V, adjusted by the external pot. Output regulation is less than five percent for 0 to 10 mA and less than 5 percent for 0 to 0 mA.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Schematic Diagram LM1877 Audio power amplifier circuit
15W FM RF Amplifier with 2SC2539
Electronics Projects: Simple 12 Volt Day Night Switch
simple tv audio video transmitter
Wein Bridge Oscillator using ic 741 op amp
Handball
Solar Based Multipurpose Charger Circuit
DC Analysis of a MOSFET Transistor Circuit
HV REGULATOR WITH FOLDBACK CURRENT LIMITING
Automatic White-LED Garden Light
Breaker control signal circuit manually



Top