Constant current circuit using LED
This is Constant current circuit using LED. Normally the voltage drop across LED while forward bias will be about 1.2 to 1.4 volts depend on type of LED by has the temperature coefficient is -1.5 mV per degree Celsius. Which similar to the temperature coefficient of junction. between a base …
Super Steady Zener diode voltage regulator circuit
This circuit is used for controls the voltage battery is steady, which the Zener diode voltage regulator circuit apply very low current about 1mA only, cause there is ripple voltage about 1 mV at voltage changing between 10 to 30 volts. As circuit the output is fixed to 8V. In …
Dual DC power supply rectifier using 2 terminal transformer
There are many ways to build the Dual DC power supply rectifier from a transformer that has one secondary coil.This good way as Figure 1 use two bridge diodes. The first section is normally working, others section (D1-D4) will work by AC signal from C1 and C2. To filter DC …
5 volts DC Regulator Without Transformer Using MOSFET
This is 5 volts DC Regulator power supply that without the transformer so small size, use the MOSFET is based. It is suitable the digital circuit. Caution! This circuit requires very careful to create. Because there is a high voltages many areas. The diodes D1 to D4 are used to …
10V to 350V Adjustable Regulator DC Power Supply
Here is an adjustable regulator DC power supply circuit that can be provided the output high voltage is 10V to 350V. It use the transistor is based so we use often use them. Now, a transistor can tolerate more high pressure. For example; in this circuit we will use number …
Cheap adjustable  0-30V 2A Laboratory DC Power Supply
This 0-30V power supply is the variable voltage Regulator at 2A max, by used IC-723 for control volt stable regulated. The 2N3055 power transistor for boost up current to 2 Amp. It suitable for general electronics work shop. Because it is a simple circuit and easy circuit. In addition to …
0-30V,0-2A adjustable  voltage and current regulator
This is the 0-30V,0-2A adjustable voltage and current regulator that developed from the cheap adjustable 0-30V 2A Laboratory DC Power Supply project using LM723 is used widely, for a long time. This project can control the amount of current flow is maximum. We modified the circuit as circuit in Figure …