clap circuit

[electronics technician]

There are some tips on biasing,etc on this site:

http://www.rason.org/Projects/bipolamp/bipolamp.htm

Another place to look is the E-Book at All about Circuits.

thanks i will check it out

im frustrated with this circuit i have been on this for almost a month now trying different combinations of pinouts and still no working project

To get this sorted, you're going to have a very long, careful and methodical troubleshooting session. Make some coffee, you'll be needing it.

Type the part numbers for the transistors you have into Google, find the data sheets, and check the pinouts. There is no short cut or substitute for this. Assume nothing.

If you can, remove the transistors from your board and replace them with brand new ones, correctly connected. This will help ensure you're not wasting time trying to build a circuit with parts which have been damaged by incorrect use.

Go round your circuit with a multimeter, and check what voltage exists at every point.

EVERY point.

When you have that information, post up a clearly annotated schematic, and maybe someone will be able to give you some pointers as to where faults exist, or some further experiments to try. A detailed, methodical analysis will look good in your report even if the circuit never works, so this is anything but wasted effort even if nobody replies at all.

Post a photo of your board. Make sure it's clear, sharp, and has good lighting.

Without a crystal clear picture of what your board looks like and what voltages exist where, it's impossible to debug it remotely.

i will post the pictures asap thanks for the advice

[electronics technician]

are the transistors supposed to work as cbe and ebc or just ebc  with flat spot facing you
2n3904 npn transistors

[Rerouter]

The transistor will only work in the pinout on the datasheet, and you can blow up most transistors if you feed more than 5V across the emitter to the base, (reversed polarity on NPN)

with it facing you, wire it up as per this image http://www.electronicecircuits.com/wp-content/uploads/2010/03/2N3904-NPN-General-Purpose-Amplifier.jpg

And as per the first page of this thread, take some good images and we may be able to spot something obvious (just probably label the designators on the image in paint to make it easier to trace out)

[electronics technician]

i wired it exactly like that but i think the transistors itself are the problem i triple checked the circuit for wiring errors which i dont make often but when i powered it up the relay was clicking but not when i clapped  so i will get more transistors and give and updateon how it went

[electronics technician]

i got it working the transistor Q2,3,4 were bad they were shorting across all pins thanks for all the help