does anyone knoe where i can get a mega phon circuit schematic w/ instuctions
or at least a part list

 

Yes, a megaphone is an amplifier. You don't need a parts list. ALl the values of the parts in your schematic are labelled and show you the values you need. The op-amp also has a number. Just put the circuit together and (I presume) connect the output to some speakers. You may need a small transformer to match to match the impedence of your circuit with the impedence of speaker.

 

also i got a potentiometer with a built in spdt switch and it has 6 soldering terminals 3 at the locatation theyre normally at and 3 on the very bottom. what are the three on the bottom for

 

My guess is that the 3 terminals are for the SPDT switch. YOu did say the potentiometer had a switch built in.

 

i also forgot to mention i substituted a 47 uf capacitator for a 33 uf and a .047 uf for a .05 uf and a 244 uf for a 250 uf

 

i have never seen a spdt switch with 3 terminals though

 

By definition a SPDT switch always has 3 terminals.
http://en.wikipedia.org/wiki/Switch

What you thought was a SPDT switch was not one.

You probably can substitute the capacitors. It depends on the circuit. I can't see anything horrible happening if you substitute in this circuit.

 

Yes, Single Pole Double Trough. This means one in, two outs, or two ins, and one out. Very common and useful switch! :cool:

 

It is very difficult to make one NOT work. If there is an AM broadcast radio station near you, you can pick it up simply by touching a wire to the ungrounded pin 2. You should hear audio through your speaker. In most cases, the cap between pins 1 and 8 is optional, only used to increase gain. If you are having trouble, and you have the device wired correctly, I should think your problem is in whatever you are using for input, whether it be electrec mike or other source.

__________________
All those who believe in psycho kinesis, raise my hand.

 

i didnt hook anythin up to those 3 terminals

 

No problem, as long as your 47uF and 244uF are electrolytics.

__________________
All those who believe in psycho kinesis, raise my hand.

 

i am uusing a condenser mike

 

im usin a 9v battery to power it
and i didnt ground any of that stuff i just connected all the things that were supposed to be grounded together

 

actually im usin a 220 uf

 

my speaker is a 8 ohm 1 1/8 diameter mini speaker