MJ2955 | Electronic Project Circuits

Posts Tagged ‘MJ2955’

MJ2955 Switching Power Supply 12V 10Amp

The switching power supply provides 12 volts, at 10 amps, maximum, using a discrete transistor regulator with an op-amp functioning as a comparator in the feedback circuit.

With reference to the schematic, the front panel power-on light is not shown. There is no adjustable current limiter in this unit, although R1, R2, R3, Q2, R8, R9, C5 and Q4 set the current limit to approximately 10 amps. As you can see, the design is very similar to that of a linear power supply, except that L1, and D1 have been added, and U1 operates in a switching mode as a comparator with a small amount of hystersis. The switching frequency of this unit varies with the output current drawn by the load. This is an undesireable feature, which is why PWM regulators are used today. With a PWM regulator, the switching frequency is constant and will produce spurs only at known discrete frequencies rather than spurs at all frequencies. The Darlington-connected pass transistor block in the schematic is there twice (in parallel) for robustness. R4 in an internal trim-pot that can set the output voltage anywhere between 5 to 15 volts.

Read More Source :http://members.tripod.com/michaelgellis/power4.html

Be the first to comment - What do you think? Posted by admin - August 16, 2007 at 1:51 pm

Categories: High current power supply, Power supply, Switching power supply Tags: 12v switching power supply, CA3140, MJ2955, pwm power supply

7805+Mj2955 power supply 5V 5A for digital circuit.

This is circuit dc regulator power supply 5V at current 5A, I used it for my digital production. The mian part electronics is IC-7805 and MJ2955 transistor .
You must use the the 9VAC 5A transformer.

Circuit power supply 5V 5A by 7805+Mj2955

PCB Power supply 5V 5A by 7805+Mj2955

Source: 79 Electron circuit

Be the first to comment - What do you think? Posted by admin - May 15, 2007 at 12:57 am

Categories: Digital, Power supply Tags: 5v power supply, digital power supply circuit, IC 7805, MJ2955

Power Amplifier OCL 40W by 2N3055+MJ2955

The 40W Amp OCL 2N3055+MJ2955 is easy to build,
and very inexpensive. To use Power Supply +35V -35V 2A.
Transistor 2N3055+MJ2955 must be mounted on heatsink.
Can be directly connected to CD players, tuners and tape recorders.

Circuit 40W Amp OCL 2N3055+MJ2955