8051 programmer circuit 40-pin, 20-pin RS232 COM port processor designed for programming is done from the 5v USB input for feeding there. There are circuits in the installation program, but the menu icons the chinese language to be solved for the use or alternative programs you can try. Pcb circuit diagram, you can open files with protel99s.
8051 programmer Protel project and program files:
8051 programmer circuit ZIF + USB Powered
Password: 320volt.com
Published: 2011/01/28 Tags: programmer circuit
Amplifier Circuits 250Watt 5 Different Designs
There are 5 pieces all amplifier circuit diagram according to the case considered the same, but different transistor circuits, printed circuit boards have drawings of all relays solid speakers retarding’s also the last one pcb circuit added as a powerful SUPPLY CIRCUIT
General characteristics of the 250w amp circuit
Harmonic Distortion: 0.009% at 1kHz 250W; 250W 10kHz 0.013%
intermodulation distortion: 0.022% 180W / 80 7 kHz
Input Sensitivity: max: 1.55 V