Hello. I am looking to build a guitar stompbox that will produce a deep bass-like sound. I have a number of components, mostly stripped from old electronics lying around my house, but due to the amount of money i have spent on recent purchases of soldering iron and pcb boards and various other tools and things, I have promised the wife i wont buy anymore components and will try to build from what ive got.
These include:
3 50k potentiometers
4k:2k input transformer
900:8 output transformer
2x 4560D dual op amp ic
2x 4558d dual op amp ic
An7112 amplifier ic
7476 dual jk flip flop
Npn & pnp transistors
Lots of diodes, resistors and capacitors
2 switches, one of which is built into one of the potentiometers
Input and output jacks
9v battery connector

Help would be appreciated. i have been trying to educate myself on how such a circuit will operate and will continue to do so.

 

You're not going to achieve your goal with a random pile of electronic components.

You need to start with circuit schematic. Then see if you have any of the necessary components. Then start shelling out money for the rest.

Google: octave down guitar effects pedal circuits

Ken

 

Check Wikipedia

https://en.wikipedia.org/wiki/Octave_effect

 

Been working on this:

 

Been working on this:

That circuit would not work. You have both /SET and /RESET tied to GND. The flip-flop will not toggle.
Also digital circuits will put out square waves which would be very harsh sounding.

 

A sophisticated technique would be to use a digital signal processor to digitize the input signal and measure the fundamental frequency. Then you can synthesize a new sound based on that frequency.That is how "chorus" can be generated, i.e. you can add the third and fifth notes to create a triad.

 

That circuit would not work. You have both /SET and /RESET tied to GND. The flip-flop will not toggle.
Also digital circuits will put out square waves which would be very harsh sounding.

I am aware of the nasty sounding harmonics associated with square waves, but still fancying this as a first pedal build. Thanks for your advice on the flipflops, i have a quad NAND chip and thought to implement them as a NOT between the j & k inputs. The logic tables ive attempted suggest the following circuit would work.

 

Now however, you have left the S and R inputs floating. Not a good idea, as unpredictable results may occur. In order for the flip flop to operate, based on its JK inputs and a CLK signal, S and R must be high.

 

Now however, you have left the S and R inputs floating. Not a good idea, as unpredictable results may occur. In order for the flip flop to operate, based on its JK inputs and a CLK signal, S and R must be high.

Thankyou