Mutchus

This circuit may be used where a high current is required with a low ripple voltage (such as in a high powered class AB amplifier when high quality reproduction is necessary ). Low Ripple Regulated Power Supply Circuit Diagram PARTS LIST R1 2.2KΩ 1W R2 56Ω 1W R3 1oKΩ 1W C1 1000µF 63V C2 100µF 50V C3 470µF 50V D1, D2, D3, D4 6A Bridge Rectifier D5 500mA Zener Diode (see description) Q1 2N3055 Q2 2N3054 Q1, Q2, and R2 may be regarded as a power darlington transistor. D5 and R1 provide a reference voltage at the base of Q1. D5 should be chosen thus: D5=V out -1.2 C2 can be chosen for the degree of smoothness as its value is effectively multiplied by the combined gains of Q1/Q2, if 100µF is chosen for C2, assuming minimum hef for Q1 and Q2, C=100×15(Q1)×25(Q2) =37000µF.

The circuit above get from -20 volt DC the rectifier diode which is fed to the collector of the Darling pn pass transistor , a TIP105 . The diode use IN4007. The base drive to the TIP105 is supplied through resistor R5. The base of the TIP105 is driven from Vz terminal at pin 9 , which is the anode of a 6.2 -V zener diode that connects to the emitter of the uA723 output control transistor. The method of providing the positive feedback required for foldback action is shown. This technique introduces positive feedback by increased current flow through resistor R1 and R2 under short circuit conditions. This forward biases the base emitter junction of the 2N2907 sensing transistor , which reduces base drive to the TIP105.

Quickly find a reliable and cost effective a simple regulated 12 Volt power supply  Notes: This circuit above uses a 13 volt zener diode, D2 which provides the voltage regulation. Approximately 0.7 Volts are dropped across the transistors b-e junction, leaving a higher current 12.3 Volt output supply. This circuit can supply loads of up to 500 mA. This circuit is also known as an amplified zen-er circuit .  

                                    Powered with solar panel, the circuit will give you 5V pure regulated DC voltage. The circuit is made up of an oscillator transistor as well as a regulator transistor. The solar panel charges the battery when sunlight is bright enough to generate a voltage above 1.9v. A diode is necessary between the panel and also the battery as it leaks about 1mA from the battery when it really is not illuminated. The regulator transistor is intended to limit the output voltage to 5v. This voltage will likely be maintained over the capability of the circuit, which is about 10mA. The oscillator transistor should be a high-current sort as is is turned on for a extremely limited time period to saturate the core of the transformer. This energy is then released as a high-voltage pulse. These pulses are ...