Hobby Circuits
Hobby Circuits and Projects
- 38 KHz Astable Multi vibrator
- AC POWERED WHITE LED LAMP
- Amplifier Protection circuit
- BATTERY MONITOR
- Cable Signal Tester
- Car DC Adapter
- DANCING LIGHT
- DIAC CONTROLLED LED FLASHER2
- Doc1
- Doc2
- ELECTRONIC MAIL BOX
- ENTRY ALARM
- ESK 4 RAIN ALARM
- FET Pre Amp
- FIRE ALARM ESK 7-E
- GigaHertz Signal Detector
- heat controlled soldering iron
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- I Hz Pulse Generator
- IR RECEIVER
- LA 4440 Stereo Amplifier
- LOCKER GUARD
- LOGIC STATE INDICATOR
- Low Battery Indicator
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- Mobile Phone Travel Charger
- MOCK FLASHER
- PANIC ALARM
- Pest Chaser
- photodiode movement detectyor
- POWER ON MONITOR
- Power supply with short circuit indication
- Precision Monostable
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- SHADOW ALARM ESK 4C
- SHORT CIRCUIT INDICATOR
- Solar charger with Cut off
- SOLAR CHARGER
- TELEPHONE LAMP
- Telephone Status Indicator
- TEMPERATURE METER
- THREE STATE VOLTAGE INDICATOR
- TRAFFIC ALERT
- USB Mobile Charger
- USB READING LAMP
- Variable Power Supply
- wire free door guard
- Emergency Lamp Battery Protector
- Power LED Lamp
- Simple Solar Lamp
- Tricky Charger
- Low cost Pilot Lamp
Good circuits.
Wonderfull blog, it is full of important information
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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
Siddiq Which is circuit. Mention so that I can see D.Mohankumar
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)
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)
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]
dear sir ,
the circuits are very useful.Thank you,
with regards-
jp
Thanks for the feedback
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
Hello Siddiq
Send the details, if possible the circuit diagram
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