Hobby Circuits


Hobby Circuits and Projects

 


  1. 38 KHz Astable Multi vibrator
  2. AC POWERED WHITE LED LAMP
  3. Amplifier Protection circuit
  4. BATTERY MONITOR
  5. Cable Signal Tester
  6. Car DC Adapter
  7. DANCING LIGHT
  8. DIAC CONTROLLED LED FLASHER2
  9. Doc1
  10. Doc2
  11. ELECTRONIC MAIL BOX
  12. ENTRY ALARM
  13. ESK 4 RAIN ALARM
  14. FET Pre Amp
  15. FIRE ALARM ESK 7-E
  16. GigaHertz Signal Detector
  17. heat controlled soldering iron
  18. heat sensor
  19. I Hz Pulse Generator
  20. IR RECEIVER
  21. LA 4440 Stereo Amplifier
  22. LOCKER GUARD
  23. LOGIC STATE INDICATOR
  24. Low Battery Indicator
  25. Mobile Charger using Bike Battery
  26. Mobile Phone Travel Charger
  27. MOCK FLASHER
  28. PANIC ALARM
  29. Pest Chaser
  30. photodiode movement detectyor
  31. POWER ON MONITOR
  32. Power supply with short circuit indication
  33. Precision Monostable
  34. Remote Jammer
  35. SERVO CONTROLLER
  36. SHADOW ALARM ESK 4C
  37. SHORT CIRCUIT INDICATOR
  38. Solar charger with Cut off
  39. SOLAR CHARGER
  40. TELEPHONE LAMP
  41. Telephone Status Indicator
  42. TEMPERATURE METER
  43. THREE STATE VOLTAGE INDICATOR
  44. TRAFFIC ALERT
  45. USB Mobile Charger
  46. USB READING LAMP
  47. Variable Power Supply
  48. wire free door guard
  49. Emergency Lamp Battery Protector
  50. Power LED Lamp
  51. Simple Solar Lamp
  52. Tricky Charger
  53. Low cost Pilot Lamp

13 responses to “Hobby Circuits

  1. I loved as much as you will receive carried out right here. The sketch is tasteful, your authored material stylish. however, you command get bought an nervousness over that you would like be turning in the following. sick without a doubt come further earlier again since exactly the same nearly a lot continuously inside case you protect this hike.

  2. You really make it appear so easy with your presentation but I in finding this matter to be actually something which I think I’d never understand. It sort of feels too complicated and very wide for me. I am looking ahead in your next post, I’ll try to get the grasp of it!

  3. sir i made one using 741 but i am cofuswd abou its workin i gave input from 2-3 and got output from 6-3 plz tell how it works

  4. thank u for replying sir,

    i have already tried op-amp, transistor as amplifier but failed…..u may give an effective op-amp/ transistor etc. amp which will suit these parameters..

    the piezo generates a 5 mV AC when strummes and the keyboard ic whos one combination has two sets of wires ….on have 3.5 v which requires to go to the second terminal
    thus i need to switch the two wires using small piezo o/p

    plz help since i have searched the net. with no success ad reached u

    it would be great success if u give a switch which conducts when small ac signal is given

    if u have time plz do it u r self having a piezoelectric and keyboard ic trying on u r notepad

    thank u very much sir

    regards,
    siddiq
    solapur(MH)

  5. thank u for replying sir,
    plz refer the given diagram and help me
    i have already tried op-amp, transistor as amplifier but failed…..u may give an effective op-amp/ transistor etc. amp which will suit these parameters..

    it would be great success if u give a switch which conducts when small ac signal is given

    if u have time plz do it u r self having a piezoelectric and keyboard ic trying on u r notepad

    thank u very much sir

    regards,
    siddiq
    solapur(MH)

  6. Respected sir,
    I am sarthak rane,engineering 3rd year student. i making mobile phone charger as a mni project,but i am not able to charge my samsung mobile phone E2550,having battery rating mention as 3.7V 800mAh . i am using 4.7uf/63V instead 4.7uf/25V. when ever i connect my cell phone in off mode my LCD of phone keeps on blinking . i am using 9V battery as input instead of 12 V suply or 1.5*8 pen cells.i am referring your [https://dmohankumar.files.wordpress.com/2010/05/mobile-cell-phone-charger.pdf ] link. Sir i need your kind help.
    Thank you
    Sarthak Rane
    [sarthak.rane@gmail.com]

      • Sir plz help me…i m trying to make a virtual drum set using pc keyboard and a sampler sofware which plays respective drum sample as the keyboard key is pressed. ?.so here i use the pc keyboard ic,,,,now i one combination on the ic is to be conncted to a piezo transducer so that it shorts the two pins on the ic as soon as the piezo generates small ac signals…….. Ill be greatfull to u if u solve my problem

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