Electronics Project Repository 

Distributed under the CERN Open Hardware License (https://ohwr.org/cern_ohl_p_v2.txt)C

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• 1. Crystal radio

     Sound clip1, clip2, clip3

     Contributors: Chirag Kalelkar, Chandranibh Brahma (ME), Yash Foujdar (ME)

• 2. Dual-output regulated power supply (+/-12V) [Ver. 1]

     Contributors: Chirag Kalelkar, Yash Foujdar (ME)

• 3. Dual-output regulated power supply (+/-12V) [Ver. 2]

     Contributor: Chirag Kalelkar

• 4. Gas alarm

      Movie

      Contributors: Chirag Kalelkar, Yash Foujdar (ME), Rickarya Das (EE)

• 5. Lorenz model

     Movie

     Contributor: Chirag Kalelkar

• 6. Portable white noise source [Ver. 1]

        Contributor: Chirag Kalelkar

• 7. Pocket AM radio

     Sound clip1, clip2, clip3

        Contributor: Chirag Kalelkar

• 8. LED candle

        Movie

                             Contributor: Chirag Kalelkar

• 9. Tesla coil (Slayer Exciter circuit)

        Movie

        Contributors: Tankala Susritha (EE), Chirag Kalelkar

• 10. Metal detector

          Cellphone, Aluminum-sheet, Wooden-disk, Screwdriver-along-coil-axis

          Contributors: Grandhi Satya Sai (EE), Chirag Kalelkar

• 11. Useless machine (simplest possible design)

          Movie

          Contributors: Tusharanshu Pandey (ECE), Chirag Kalelkar

• 12. Human proximity/Metal detector

          Hand, Aluminum-sheet, Paper

            Contributor: Chirag Kalelkar

• 13. (a) Speaker amplifier module with volume and gain control (LM386)

            Movie

                    (b) Microphone pre-amplifier module with gain control (NE5532) 

               Movie        

            Contributor: Chirag Kalelkar

• 14. White noise source (for regulated power supply) [Ver. 2]

          Contributors: Chirag Kalelkar, Tusharanshu Pandey (ECE)

• 15. Dual-output regulated power supply (variable, portable) [Ver. 3]

        Movie

            Contributors: Tusharanshu Pandey (ECE), Chirag Kalelkar, Rickarya Das (EE)

• 16. "Pseudo-AM" radio transmitter (portable) [receiver: Proj. 7]

            Contributors: Chirag Kalelkar, Harshith Reddy (EE)

• 17. Lock-in amplifier

            Contributors: Viraj Bhosale (ECE), Chirag Kalelkar

• 18. Diode tester (portable)

Movie

            Contributors: Sanjay R (ECE), Chirag Kalelkar

• 19. Oscilloscope art

Cat, Butterfly, Heart, Thumbs-up, Text

            Contributors: V D N Eswar Tati (ECE), Chirag Kalelkar

• 20. Instrumentation amplifier

            Contributors: V D N Eswar Tati (ECE), N V Hardhik (ECE), Chirag Kalelkar

• 21. PID (Proportional-Integral-Derivative) controller

            Contributors: K Rupya Lakshmi Sai Sri (ECE), Chirag Kalelkar

• 22. Audio transmission via infrared

            Contributors: Harshith Reddy (EE), Chirag Kalelkar

• 23. Voltage-Controlled Oscillator

            Contributors: Sulagna Basack (ECE), Sagnik Mondal (ECE), Chirag Kalelkar

Last update: 6/4/26