Power supply

Repair Dell GX620 computer with myself

I had been using Dell GX620 Computer for a long time because it has good and durability. I lost it some days ago. My friend who is a computer repairer said the power supply is having problem. He told me to buy it at amazon.com,they are very nice it has low cost and free to deliver too. Read more

Easy Power supply for cassette player

This circuit that you see, It is an one style of an easy simple power supply, for a recorder or a cassette player in the car which used voltage 12V.It is only using the current abount 100mA.
When it occured over load current at output.it will not damaged with circuit.(have only current 2Amp) While it can to used the voltage about 6Volt at 800mA max.
The resistance of R1 serves to limit the short circuit current at about 2 amps.And reduce the power consumption of the series regulator transistor Q1.(which acts as the emitter follower circuit with a base voltage from R2, D1).
Here is the diode resistance should be 1 watt or more.
This circuit can be assembled into a small metal box, compact, easily. Using the heater box as cooling plate to transistors Q1 with built-in.
Designed by Mr. Enrich Reading Ford. Palmerston North City Seal Post Teen & Air UK.

Regulator to improve better

In some special applications, required supply voltage, which is very accurate, and It looks like, how popular each one. Then, to improve the output voltage of voltage regulator better.
With “improve” the Commonwealth, (that is to increase the electrical potential, it gives rise).But this, have in vain like that in short-circuit common, often looks into the reverse bias, making it less protection, the result is a circuit can be damaged easily.
For this circuit, it is a problem that has one.By placing a diode German Niam D1, to protect the Commonwealth to prevent the reverse bias exceeds 0.2 volt when the short-circuit. , that is, not to prevent regulator damage.
In addition, adding a capacitor C2 to, it also ensures that the circuit will have a better image stability. The diodes D1 and D2 (for example) increases the output voltage to rise about 1.3 volts.
Designed by Mr. J. A. Rowe City Rugby Warwick New England’s silly.