Active filter circuits are made using ne5532 opamps, there are 2 and 3 way versions (low pass, band pass, high pass) also there are formulas for opamp calculations and sample schematics, there are pcb drawings of all circuits, working voltages are +- 15v symmetrical.
Crossover, Active Audio Filter Circuits NE5532 Opamp ZIP File Password: 320volt.com
Multi EEPROM Programmer Circuit
The computer’s serial port or lpt eeprom programming circuit running through a lot of useful supports model. Eeporm programming circuit between 7 …. 15v dc adapter can run with. I have not tried, but as computer software used prograg pony. Moreover, the circuit diagram pcb and dosyalarıda has been prepared by eagle.
Zip file has protected.. what’s the password?
320volt.com