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| The following circuits are have been designed and published for educational purposes. Feel free to download them, use and adapt them or improve upon them. Though if you use it for commercial purposes please do let me me know. | |||
| All files are in Adobe PDF format. You can download the free Acrobat reader to view them from here. | |||
| 1 | 0 to 5 V DC controler | 84 kb | Download PDF |
| 2 | 555 DC motor speed controler | 84 kb | Download PDF |
| 3 | Audio Bass & Treble control | 92 kb | Download PDF |
| 4 | Audio to DC Voltage convertor | 64 kb | Download PDF |
| 5 | Bar graph pressure gauge | 100 kb | Download PDF |
| 6 | DC motor speed controler | 96 kb | Download PDF |
| 7 | Digital volume control | 80 kb | Download PDF |
| 8 | Dual power supply | 80 kb | Download PDF |
| 9 | Frequency to voltage convertor | 92 kb | Download PDF |
| 10 | Lamp flasher | 96 kb | Download PDF |
| 11 | Mic preamplifier | 80 kb | Download PDF |
| 12 | PCB drill speed controler | 96 kb | Download PDF |
| 13 | RC battery monitor | 88 kb | Download PDF |
| 14 | Solid state audio recorder | 96 kb | Download PDF |
| 15 | Sound activated switch | 88 kb | Download PDF |
| 16 | Stepper motor controler | 100 kb | Download PDF |
| 17 | Strobe | 76 kb | Download PDF |
| 18 | Telephone scrambler | 104 kb | Download PDF |
| 19 | Temprature to frequency convertor | 100 kb | Download PDF |
| 20 | Tesla Coil | 96 kb | Download PDF |
| 21 | Tiny audio amplifier | 80 kb | Download PDF |
| 22 | Toggle switch | 80 kb | Download PDF |
| 23 | Voltage to frequency to convertor | 80 kb | Download PDF |