Power Supply Adapter

Offline switching power supply which resulting 5VDC/10A output from 110/220V AC home power electric. See the parts list, there should be different MOSFET type for 110V anf 220V volatage input. Below the diagram : And here the parts list: The schematic shows a 50-W power supply with a 5-V 10-A output. It is a flyback converter operating inside the continuous mode. The circuit has functionality of a main side and secondary side controller will full-protection from fault conditions such as overcurrent. When the fault condition has been removed, the power supply will go into the soft-start cycle just before recommencing normal operation.

The IC8211 presents the voltage reference and regulator amplifier, although Q1 will probably be the series pass transistor. R1 defines the output current of the IC8211, although C1 and C2 present loop stability and as well act to suppress feedthrough of input transients to the output supply. R2 and R3 define the output voltage as follows: Furthermore, the values of R2 and R3 are preferred to create a bit volume of standing current in Q1, which provides additional stability margin on the circuit.Where accurate setting of the output voltage is needed, either R2 or R3 could possibly be designed adjustable. If R2 is designed become adjustable,then the output voltage will vary linearly with the shaft angle; nevertheless, if the potentiometer wiper was to open the circuit , the output voltage would rise. Normally, for that reason, it is far more beneficial to provide R3 adjustable, due to the fact this can give fail-safe operation.

Check out the signal output... this power supply will cut off the negative amplitudo and pass the positive AC signal. A TMOS power FET , Q1 , and LM393 comparator supply a higher performance rectifier circuit . When V A exceeds V B , U1's output turns into higher and Q1 conducts. Conversely, when V B exceeds V A , the comparator output gets low and Q1 does not conduct. The forward drop is determined by Q1's on resistance and latest I. The MTH40N05 has an on resistance of 0.028 Ohm; for I = 10 A, the forward drop is much less than 0.3 V. Typically, the very best Schottky diodes usually do not even start conducting below several hundred mV.

Here the 9V Stabilized power supply circuit. Built based IC 723 and featured with amp booster using 2N3055. The 2N3055 must be mounted on a coolrib/heatsink. Schematic Diagram: Components List: R1 = 0.56 Ohm, 1 Watt, wire-wound type, 5% R2 = 750 Ohm, 5% R3 = 2K7 (2700 ohm) P1 = potentiometer, 1K, Linear C1 = 2200uF, 35V C2 = 470pF T1 = 115/10 VAC transformer. Center Tap (ct) not needed. IC1 = uA723, LM723, or equivalent. Q1 = 2N3055, NTE130, or substitute. (TO-3 case) Mount on a coolrib! BR1 = 80V-5A (or better) Circuit Notes: C1 filters the noise and spikes off the AC. Adjust the circuit for 9V or 12V output voltage, or whatever voltage level your pc mini drill is using, with the P1 potentiometer. Q1 can also be a MJ2955 in a TO-3 case. Design by Tony van Roon Source: http://www.sentex.ca/~mec1995/circ/9vstable.htm

This circuit is a current limited lead acid battery charger built around the famous variable voltage regulator IC LM 317. The charging current depends on the value of resistor R2 and here it is set to be 700mA. Resistor R3 and POT R4 determines the charging voltage. Transformer T1 steps down the mains voltage and bridge D1 does the job of rectification. C1 is the filter capacitor. Diode D1 prevents the reverse flow of current from the battery when charger is switched OFF or when mains power is not available. The schematic diagram : Circuit Notes: Assemble the circuit on a good quality PCB. F1 can be a 2A fuse. T1 can be a 230V primary, 35V/3A secondary step down transformer. LM317 must be fitted with a heat sink. If 3A Bridge is not available, make one using four 1N5003 diodes. R2 = 0.85 ohm is not a standard value. You can obtain it by combining a 6.2 ohm and 1 ohm resistors in parallel. To setup the charging voltage, power ON the charger and hook up a voltmeter across the output...

This is a DC battery tester circuit diagram. The circuit will work for DC battery from 1.5V up to 9V. Electronic Parts List: R1 = 18K Ohm R2 = 240 Ohm R3 = 8.2K Ohm R4 = 3K Ohm R5 = 10 Ohm M1 = Panel Meter (Any Panel Meter will work) Source: dc battery tester

Simple N iCad battery charger with current and voltage limiting features. This circuit should be very easy to built. Circuit source: NiCad Battery Charger NiCad Battery Charger circuit