Free circuit diagrams
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Simple diagram of Vu meter
2010-05-11 23:51:00
This is a simple vu meter people normally use Vu meters to get a good appearance for their amplifiers and for their audio setups.Here I have used common Ic LM3915 and LM3916.You can fix 19 LEDs for this circuit diagram.Note# you can operate this circuit with 12V power supply# Fix this circuit ona PCB to get good result.
2010-05-11 23:51:00
This is a simple vu meter people normally use Vu meters to get a good appearance for their amplifiers and for their audio setups.Here I have used common Ic LM3915 and LM3916.You can fix 19 LEDs for this circuit diagram.Note# you can operate this circuit with 12V power supply# Fix this circuit ona PCB to get good result.
NE 555 Pulse generator
2010-05-09 22:42:00
Most of our members asked pulse generator circuits. so this is a simple and common circuit.and you can use this with your light circuit diagrams too.Note# Don't supply more than 15V
2010-05-09 22:42:00
Most of our members asked pulse generator circuits. so this is a simple and common circuit.and you can use this with your light circuit diagrams too.Note# Don't supply more than 15V
Simple Audio power meter
2010-05-09 02:19:00
This is simple audio power meter.When you use high power speakers this circuit is so important Because you can keep your speakers without burning.Here When the speaker out puts 1W green color LED will light up,for 1.5W you will be able to see orange color,When speaker out puts more than 3W you will be able to see red color.Note# The power levels mentioned are valid for 4-Ohm speakers. For 8-Ohm speakers you have to divide all the resistor values by two# this circuit cant drive more than 40W continuously.# If you want more LEDs you can attach LEDs as the same way
2010-05-09 02:19:00
This is simple audio power meter.When you use high power speakers this circuit is so important Because you can keep your speakers without burning.Here When the speaker out puts 1W green color LED will light up,for 1.5W you will be able to see orange color,When speaker out puts more than 3W you will be able to see red color.Note# The power levels mentioned are valid for 4-Ohm speakers. For 8-Ohm speakers you have to divide all the resistor values by two# this circuit cant drive more than 40W continuously.# If you want more LEDs you can attach LEDs as the same way
AC powered LED Indicator
2010-05-09 02:03:00
This is an indicator you can use this circuit with your Ac electronic items.Here I have used normal Led.Attach purple color connections to the AC line.I suppose this will be a wonderful circuit for you.Note# This is not a good circuit for kids Because here we use 230V So don't try to build this.# Build this circuit on a PCB
2010-05-09 02:03:00
This is an indicator you can use this circuit with your Ac electronic items.Here I have used normal Led.Attach purple color connections to the AC line.I suppose this will be a wonderful circuit for you.Note# This is not a good circuit for kids Because here we use 230V So don't try to build this.# Build this circuit on a PCB
Brightness controller circuit diagram for your car
2010-04-09 22:45:00
This is brightness controller circuit diagram.You can use this circuit for your car or for your bike.Here I have used famous IC NE 555.Note# Use 6V bulbs with this# Build this circuit on a pcb.
2010-04-09 22:45:00
This is brightness controller circuit diagram.You can use this circuit for your car or for your bike.Here I have used famous IC NE 555.Note# Use 6V bulbs with this# Build this circuit on a pcb.
Security alarm
2010-04-09 22:01:00
This is Security alarm .If somebody disconnected the wire loop The speaker will generate a sound.I have used a circuit for my land.Then when a robber enter for my land i can know it earlier.when you setup this set the wire loop at the height of 1 feet from the ground.Note# Build this circuit on a pcb# use a thin coil as the wire loop
2010-04-09 22:01:00
This is Security alarm .If somebody disconnected the wire loop The speaker will generate a sound.I have used a circuit for my land.Then when a robber enter for my land i can know it earlier.when you setup this set the wire loop at the height of 1 feet from the ground.Note# Build this circuit on a pcb# use a thin coil as the wire loop
IR Tester Circuit Diagram
2010-03-16 08:55:00
This is an IR Tester circuit diagram.The special thing this circuit is you can measure the strength of the Ir signal by using a volt meeter.This circuit operates with 9Vto 12V.Note# Build this circuit on a pcb to get maximum result.# Use 9Vto 12V
2010-03-16 08:55:00
This is an IR Tester circuit diagram.The special thing this circuit is you can measure the strength of the Ir signal by using a volt meeter.This circuit operates with 9Vto 12V.Note# Build this circuit on a pcb to get maximum result.# Use 9Vto 12V
Dark Activated Micro circuit diagram
2010-03-09 09:10:00
This is dark activated circuit diagram.But the importance of this circuit is the size of this circuit.Here I have used famous transistor 2N3904.Here I have used photo transistor.
2010-03-09 09:10:00
This is dark activated circuit diagram.But the importance of this circuit is the size of this circuit.Here I have used famous transistor 2N3904.Here I have used photo transistor.
Fm Transmitter (200M)
2010-03-07 22:04:00
This is a Fm Transmitter circuit.This circuit can Transmit signals up to 200M.L1 is 1mH inductor.When I built this circuit I used PCB.Note# Make inductor with the support of this formular L = (d²n²) / (18d+40l)L is the inductance of the coil in uHd is the coil diameter in inchesl is the coil length in inchesn is the number of turns# Use 12V power supply for this circuit.# Build this circuit on a PCB
2010-03-07 22:04:00
This is a Fm Transmitter circuit.This circuit can Transmit signals up to 200M.L1 is 1mH inductor.When I built this circuit I used PCB.Note# Make inductor with the support of this formular L = (d²n²) / (18d+40l)L is the inductance of the coil in uHd is the coil diameter in inchesl is the coil length in inchesn is the number of turns# Use 12V power supply for this circuit.# Build this circuit on a PCB
Mini FM Transmitter Circuit Diagram
2010-03-07 21:34:00
Most of you ask about transmitter circuits so I thought to give you this circuit.Here I have used famous IC UPC1651.This circuit Can be operated with 5V power supply.Note# Use a copper wire as an antenna# Don't give more than 6V for this circuit.# Build this on a PCB.
2010-03-07 21:34:00
Most of you ask about transmitter circuits so I thought to give you this circuit.Here I have used famous IC UPC1651.This circuit Can be operated with 5V power supply.Note# Use a copper wire as an antenna# Don't give more than 6V for this circuit.# Build this on a PCB.