Mar 16th, 2009
by Electronics Online.
This power supply circuit can supply high current for your electronic project. Transistor 2N3055 is the main component which will increase the current level.
| Part |
Total Qty. |
Description/Value |
| R1 |
1 |
680 Ohm 1/4 Watt Resistor |
| C1 |
1 |
20,000 – 50,000uF 20-40 Volt Capacitor |
| C2, C3 |
2 |
100uF 50 Volt Capacitor |
| C4 |
1 |
0.1uF 50 Volt Capacitor |
| C5 |
1 |
0.01uF 50 Volt Capacitor |
| D1 |
1 |
Zener Diode (See Notes) |
| Q1 |
1 |
2N3055 Or Other (See Notes) |
| T1 |
1 |
Transformer (See Notes) |
| BR1 |
1 |
Bridge Rectifier (See Notes) |
| S1 |
1 |
SPST 250 VAC 10 A Switch |
| MISC |
1 |
Case, Line Cord, Heatsink For Q1, Binding Posts For Output |
Feb 14th, 2009
by Electronics Online.
This power supply will stabilize the voltage, both the positive voltage and negative voltage. IC 7815 will stabilize positive voltage +15V and IC 7915 will stabilize the negative voltage -15V.
If you need stabilized 15 V output, you should choose transformer output around 18-24V AC and use IC 7815 and 7915. If you need stabilized 6V output, you sould choose transformer output arround 9V-15V and use IC 7806/7906.
Feb 11th, 2009
by Electronics Online.
Circuit Description:
This amplifier uses a dual 20 Volt power supply and delivers 15 watts RMS into an 8 ohm load. Q1 operates in common emitter, the input signal being passed to the bias chain consisting of Q8, Q9, D6, D13 and D14. Q8 and Q9 provide a constant current through the bias chain to minimize distortion, the output stage formed by a discrete darlington pair (Q2,Q4) and (Q7,Q11). The last two transistors are power transitors, specifically the 2N3055 and MJ2955. The 7.02K resistor, R16 was made using a series combination of a 4.7K, 680 Ohms, and two 820 Ohms. The 1.1K resistor, R3 was made using a 100 Ohms and a 1K resistor. You can use this circuit with any walkman or CD player since it is designed to take a standard 500mv RMS signal.
Feb 10th, 2009
by Electronics Online.
You can adjust the output voltage from 0V up to 12V with variable resistor R2. This circuit can handle a 1 ampere current. The 317 must have a heat sink. The charger output is 6V, you can use the charger to charge your mobile phone battery.
Here the PCB layout:
