Hello all,
For any of those who are familiar with the science olympiad program (www.soinc.org) , I am preparing for the Mission Possible event for my state competition (TX) that will be held next weekend. I need to build a sound activated switch, so I just went out to radio shack the other day and bought a 741CN opamp (8pin)
Anyway, I will be using this piece as an amplifier for a condensor mic element and sending the output to a simple transistor swith that will flick a relay on and off.
For this competition I have had to teach myself all about the functioning of transistors, diods, etc... I thought i had it all figured out until this opamp circuit reared its ugly head.
Ive narrowed down my problems to how i am attaching the mic to the opamp, but besides that i am completely and utterly lost.
Here is my current setup:
8.5v dc current
Non-inverter input is grounded through a 10k ohm resistor
Inverter input is through a 1k ohm resistor
inverter input and output are crossed with a 10k ohm resistor
Thats about all i have actually, Im not exactly sure how to attach this to the microphone. I was thinking it would be something like this (+voltage, mic element, .47u capacitor, inverter input) but again i cannot get an output current. How exactly should I prepare the signal from the microphone for it to be transfered into the opamp circuit?
In this case the output current should be negative correct?
Any tips/tricks/hints you guys can provide on building circuits such as this will be GREATLY appreciated. Im a newB but eager to learn! If anyone has an idea for a simler sound activated switch, i would be much obliged to hear it!
Thanks again for any help
Zac
For any of those who are familiar with the science olympiad program (www.soinc.org) , I am preparing for the Mission Possible event for my state competition (TX) that will be held next weekend. I need to build a sound activated switch, so I just went out to radio shack the other day and bought a 741CN opamp (8pin)
Anyway, I will be using this piece as an amplifier for a condensor mic element and sending the output to a simple transistor swith that will flick a relay on and off.
For this competition I have had to teach myself all about the functioning of transistors, diods, etc... I thought i had it all figured out until this opamp circuit reared its ugly head.
Ive narrowed down my problems to how i am attaching the mic to the opamp, but besides that i am completely and utterly lost.
Here is my current setup:
8.5v dc current
Non-inverter input is grounded through a 10k ohm resistor
Inverter input is through a 1k ohm resistor
inverter input and output are crossed with a 10k ohm resistor
Thats about all i have actually, Im not exactly sure how to attach this to the microphone. I was thinking it would be something like this (+voltage, mic element, .47u capacitor, inverter input) but again i cannot get an output current. How exactly should I prepare the signal from the microphone for it to be transfered into the opamp circuit?
In this case the output current should be negative correct?
Any tips/tricks/hints you guys can provide on building circuits such as this will be GREATLY appreciated. Im a newB but eager to learn! If anyone has an idea for a simler sound activated switch, i would be much obliged to hear it!
Thanks again for any help
Zac