Collection Schematic

Showing posts with label OCL. Show all posts

Friday, October 31, 2014

OCL Power Amplifier Circuit MJ15003 MJ15004

This Power Amp OCL 100 watt circuit by transistors.They has been an old circuits, but very well amplifier schematic. We use only all transistor MJ15003 and MJ15004 is the main in circuits, and the power supply +38V 0 -38V 3A. follow stye of OCL amp and They has Specification are

power output : 105watt at 4 ohm load, 88watt at 8 ohms load

input sensitivity : 0.5V

Frequency response : 10-10kHZ +/- 1dB

THD: 0.07% at 50 watt , 0.1% at 100 watt.

This power amp OCL 100w is a very excellent sound quality. Since we provide the circuit in look All direct coupling form is connection join together direct all, to cut-off frequency low-loss problems, the super bass really do not tell who.

The signal Input of the tone controls enter via C1 to the base pin of transistor Q1, which together with the Q2 is differential amplifier, the signal from the collection pin of Q1 supplied to the bas pin of the Q5, which it acts as the pre-driver circuit.

- The transistor Q4 is setting level bias or act as to control Idle current in this circuit. Which we can adjust level idle current by By adjusting the VR1.

- The transistor Q3 acts as a boost trapping.

- The output signal from the Q5 will enter to base pin of Q8,Q9.which acts as the driver circuit. For the signal output to drive the output transistors Q10, Q11.

- Both output transistors Q10, Q11, we used the number on the circuit are MJ15003, MJ15004. This couple can use up to 200W, so not problem in durability.

If you want to save. May be represented by a pair of output are 2N3055, MJ2955 each of the two parallel each other instead.

100W OCL Power Amplifier Circuit MJ15003,MJ15004

Creation

-Check the assembly of all equipment to correct the circuit, without the output transistors, Using a voltmeter measure the voltage at the speaker. By also does not have a speaker. At the end of this process was completed and ready to operate immediately.

-Put the power supply to the circuit, then to measure the voltage is 0V or not higher than 0.25V, if not in this means that the circuit failure, need to check first.

-The later, on output transistors, and then use an ammeter to measure the current is supplied with short input circuit. Measuring that positive or negative wire. Then, adjust VR1 until reading about the current 20-40 mA.

- For transistor Q4, when the device successfully. Should be installed on the cooling pad. Which installation of the output transistor. To help control the the bias current output relative to the temperature change of the output transistor.

- The power supply circuit is got by power of transformer T1, which provides voltage to the coil in the secondary coil is 27-0-27 volt, 5 amp.

- The Diodes Bridge rectifier should be not lower than 5 Amp 100V, The filter capacitor C7, C8 we used a 1,000uF 50V, the voltage at the capacitor afer through the filter will can about 38V.

Wednesday, October 15, 2014

2N3055 with PCB Power Amplifier OCL 60W

This is Power Amplifier OCL 60W circuit. It is the circuit that gives bland excellent sound , because of use the transistor entirely (Hot part 2N3055 x 2) have no IC mix. Then may build difficult go to small but for what is the experienced person may have no a problem. For sound power that pay to come out about 60W at 8ohm size loudspeakers s build to sing can bail 12 inch sizes comfortablely. About story of the voltage supply for this circuit as a result the important. Should use the pressure about +/- 40V the trend doesn’t lower 3A .Other detail see in circuit picture.

Monday, September 22, 2014

300W Mosfet power amp OCL HIFI Class AB by K1530 J201

Younger student brother will take an interest to do electronics project sends a teacher. Then come to consult with me. He wants to build Mosfet power Amplifier 300W rms model the stereo Amp. Which be the character OCL the sound is good. I then try to seek the circuit gives him sees in rows the way , accidentally meet this circuit. which design by Anthony.E.Holton.

He designs this circuit well. Use power 2SK1530+2SJ201 MOSFET x 4 jigsaw puzzle parallel amounts. make have power amplify tall arrive at about 300W rms true power FULL watt. Detail other part want friends see in original circuit.