The submit describes a basic yet very helpful 0 to 50V dual power supply circuit which also contains a wide range current control feature starting from 0 to 10 amps.
The basic design of the offered 0 to 50V variable dual power supply circuit with 0 to 10 amp variable current facility is demonstrated in the above figure.
The whole design is transistor (BJT) based and is practically unbreakable. Furthermore it's built with an over load and over current protection benefits.
The two section contained in the design are precisely comparable with their configurations, the only improvement being the utilization of PNP devices in the lower configuration while NPN in the upper configuration.
The upper NPN design is set up to generate a adjustable reply beginning with 0.6V to 50V positive while the lower PNP section turns into accountable of creating an oppositely the same reaction from -0.6V to -50V output.
The highest limit might be suitably transformed by simply altering the voltage rating of the transformer. In spite of this for higher voltages you might have to properly update the BJT voltage ratings appropriately.
In both the designs, P2 implements the function of varying the voltage levels as preferred by the user, while P1 features as the current regulator and is useful for changing or set up the output anywhere from 0 to 10 amp current. Here too the maximum rating depends upon the choice of the transformer amp rating and might be transformed according to personal preferences.
T1s in the both the sections turn out to be the basic part or the heart of the whole voltage control working in the circuit, which evolves into feasible as a result of the widely used common collector configuration of the devices. The other two active BJTs only assist to apply the same simply by managing the base power of the T1s thus rendering it easy to change the thresholds to any most wanted user described voltage and current levels, as per the ratings of the transformer or the input supply.
R1 = 1K, 5 watt wire wound
R2 = 120 Ohms,
R3 = 330 Ohms,
R4 = to be calculated using Ohms law, R = 0.6/Maximum Current Limit, Wattage = 0.6 x Maximum Current Limit
R5 = 1K5,
R6 = 5K6,
R7 = 56 Ohms,
R8 = 2K2,
P1,P2 = 2k5 presets
T1 = 2N6284 + 2N2222(NPN), 2N6286 + 2N2907(PNP)
T2, T3 = BC547B (NPN) BC557B (PNP),D1, D2, D3, D4 = 6A4,
D5 = 1N4007,C1, C2 = 10000uF/100V,
Tr1 = 0 – 40 Volts, 10 Amp