free schematics

These projects and schematics are produced during my job as RF design engineer.

They are addressed for everyone who desire to continue to find out new challenges in the RF area.

Articles ( in Bulgarian )

1. N.S.Lambrev , Y.G.Strundzhev , S.N.Stoev - "Wide band balanced mixer for 0.8...3GHz" - Electropromishlenost & P. 10 / 1990

2. Y.G.Strundzhev , N.S.Lambrev - "10GHz Oscillator , stabilizied with dielectric resonator" - journal-RTE- 2 / 1990

3. P.K.Vitanova , S.N.Hristov , Y.G.Strundzhev - "Wide band amplifier-40...860MHz" - Scientific conference - Sliven 1997

4. Y.G.Strundzhev - "SAT-TV receiver" - journal-RTE- 7 / 1991

5. Y.G.Strundzhev - "IF-amplifier" - journal-RTE- 5,6 / 1991

6. Y.G.Strundzhev - "RF-oscillator (VCO) for 1,2...2,4GHz" - journal-RTE 2,3 / 1991

7. Y.G.Strundzhev - "Stereo receiver for audio programs of SAT-TV" - journal-RTE-8 / 1991

8. S.N.Hristov , Y.G.Strundzhev - "HF-generator-0,5...110MHz" - journal-RTE-5 / 1992

9. S.N.Hristov , Y.G.Strundzhev , T.Koleva - "Computing of matching network" - journal-RTE- 6 / 1993

10. S.N.Hristov , M.Kamenova , Y.G.Strundzhev - "Universal modul frequency synthesizer" - journal-RTE- 6 / 1994

11. S.N.Hristov , M.Kamenova , Y.G.Strundzhev , P.Vasilev - "Measurement of C/V characteristic of varicaps" - journal-RTE-9/1994

12. Y.G.Strundzhev - "Satelite Receiver - basic" - journal-RTE- 4 / 1991

13. S.N.Hristov , Y.G.Strundzhev , I.Ivanov - "RF bandpass filter computing with PC" - journal-RTE- 8 / 1992

14. S.N.Hristov , Y.G.Strundzhev - "Audio - Video Processing" - journal-RTE- 9 / 1991

My 144MHz transceiver

1. 144MHz receiver with IC MC3362 (Motorola)

2. 144MHz VCO with FM and audio compression

3. 144MHz 5W power amplifier

4. PLL with IC MC145151P2 (Motorola) rev.1

5. PLL with IC MC145151P2 (Motorola) rev.2

6. 144MHz TX / RX control

External Tracking Generator - 100kHz...1000MHz

( Thanks to my friend Simeon Hristov for help !!! )

1. Tracking Generator - description

2. CRT display for tracking generator- part 1

3. CRT display for tracking generator- part 2

4. CRT display for tracking generator- part 3

5. CRT display for tracking generator- part 4

6. PIC control for marker generator - schematics, topoverlayer, bottom, gerber files, software by N.Deliyski, jpeg 1, jpeg 2

ISM Transmitter and Receiver with TDA5100 / TDA5200 (Infineon)

1. ISM transmitter and receiver ( jpeg)

2. 433 MHz transmitter ( with TDA5100 - Infineon ) and 433MHz receiver ( with TDA5200 - Infineon )

3. 433 MHz receiver - top layer , bottom layer, top overlayer

4. 433 MHz transmitter - top layer , bottom layer , top overlayer

5. Gerber files - receiver and transmitter

Universal Frequency Sinthesizer

1. Universal Frequency Synthesizer - schematics

2. Universal Frequency Synthesizer - top layer

3. Universal Frequency Synthesizer - bottm layer

4. Universal Frequency Synthesizer - top overlayer

5. Universal Frequency Synthesizer - bottom overlayer

6. Universal Frequency Synthesizer - gerber files

7. Universal Frequency Synthesizer - jpeg

Universal Power Supply

1. Power supply - schematics

2. Power supply - top overlayer

3. Power Supply - gerber files

4. Power supply - 1 - jpeg

5. Power supply - 2 - jpeg

Open source program like Hiper Terminal for RS232 communications - from Nikolay Deliyski

1. Software

USB-RS232-RS485 converter - forward and backward all to all - with FT232BM chip - from Nikolay Deliyski

1. USB converter - schematics

2. USB converter - pcb - 1

3. USB converter - pcb - 2

4. USB converter - gerbers files

5. USB converters - jpeg