This power supply uses an LM317J adjustable regulator and an MJ2955 pass transistor. Ql and U2 as well as Ul should be heats inked. A suitable heat-sink would typically be 4` 4` 1` fins, extruded type, because up to 65 W dissipation...
Friday, January 10, 2014
In Circuit Transistor Tester
This simple circuit has helped me out on many occasions. It is able to check transistors, in the circuit, down to 40 ohms across the collector-base or base-emitter junctions. It can also check the output power transistors on amplifier...
Labels:
circuit,
in,
tester,
transistor
Friday, December 27, 2013
And the price of phone is reasonable and as low as possible
phone contains the charger, car charger and jammer. Weld parts due to the role of the force at time of press sealing off, causing the phone to shut down. Maintenance, in a targeted manner to strengthen key lower part of the integrated circuit or component welding generally solve the problem. The caller calls shutdown shutdown is the mobile phone can boot, network, can call the phone ringing sound when a call, the phone shut down....
Wednesday, December 25, 2013
Serial To Parallel Converter
This converter may help if just the serial port on a personal computer is free, whereas the printer needs a parallel (Centronics) port. It converts a serial 2400 baud signal into a parallel signal. The TxD line, pin 3, CTS line, pin...
Monday, December 23, 2013
Heat Sensor Circuit Diagram
Here is a simple circuit which can be used as a heat sensor. In the following circuit diagram thermistor and 100 Ohms resistance is connected in series and makes a potential devider circuit . If thermistor is of N.T.C (Negative...
Saturday, December 21, 2013
AUTO TURN OFF BATTERY CHARGER
This charger for series-connected 4-cell AA batteries automatically disconnects from mains to stop charging when the batteries are fully charged. It can be used to charge partially discharged cells...
Thursday, December 19, 2013
Crowbar Speaker Protection
Crowbar circuits are so-called because their operation is the equivalent of dropping a crowbar (large steel digging implement) across the terminals. It is only ever used as a last resort, and can only be used where the attached circuit...
Labels:
crowbar,
protection,
speaker
Subscribe to:
Posts (Atom)