Op Amp Square Wave Generator

[videophreak90]

pardon me for having very little knowledge on this, but I need some help.

**broken link removed**

I took on the task of making this square wave generator from my teacher, both of us have very little knowledge on circuitry, go figure. I have a few questions regarding the components and wiring. I have a zerox of the page from the book she got it from, unfortunately the instructions are, well there are none.

1.) are R5 and R7 also pententiometers like R2?

2.) would I have to use a 1/8th stereo plug or jack to connect to the output (6), and where do I connect the positive and negative wires?

3.) I'm using a 9v battery to power this, should I be using a wall plug instead (anywhere from 5-15v)?

4.) where do I connect the positive and negative wires on the power supply? I believe the positive is up top and the negative is the very last arrow, connected to the ground, right?

I have all of the components ready to go (except for the other two pententiometers, if needed), I'm just having a little trouble with some wiring issues.

Thanks in advance!

 

[IanP]

..are R5 and R7 also potentiometers like R2?

Yes, they are potentiometers but you can also use VRs (variable resistor) that can be adjusted with a small screwdriver ..

2.) would I have to use a 1/8th stereo plug or jack to connect to the output (6), and where do I connect the positive and negative wires?

If you use a plug (eg. jack) it’s just easier to connect to something like power amplifier, so you can ‘hear’ the generated wave ..
I’d add 1k resistor between the output [6] and the jack’s centre pin, just in case ..
The shield goes to the GND, or negative pole [opamp's pin 4] ..

I'm using a 9v battery to power this, should I be using a wall plug instead (anywhere from 5-15v)?

You can us both, from the circuit point of view doesn’t make any difference ..
The advantage of a wall plug is that you will always have power, whereas after a while the battery will deteriorate ..

4.) where do I connect the positive and negative wires on the power supply? I believe the positive is up top and the negative is the very last arrow, connected to the ground, right?

You’ve got 3 arrows on the diagram: the top one goes to the battery(+) or power supply(+), the middle one to the right is the output and the bottom one to the right is the negative (or GND – ground) pole and it is connected to the battery (-) or power supply (-) ..

Rgds,
IanP

 

[videophreak90]

Thank you very much, I did get it to work. I wired a pair of old speakers onto the board and it works great. The only thing is that the 1M ohm pententiometer does nothing that I can notice. Now to solder it onto a circuit board!

Added after 1 hours 54 minutes:

well, I screwed up soldering it to the blank board, so I just put it back onto the breadboard. Somehow I managed to get the 1M ohm pententiometer to work. I'll just give it to her like this, it was optional after all.