Sunflower Fuzz

[joelorigo]

Thanks to several of you on this board for help making this batter power only Sunflower. One member gave me transistors and another walked me through the battery only modifications including sending diagrams and photos of his. Awesome!
And as a beginner at pedal building, I'm open to suggestions if you see something wonky.

 

[Chuck D. Bones]

Nice front panel design!

 

[PapaBear]

Nice graphic!

 

[caiofilipini]

One member gave me transistors and another walked me through the battery only modifications including sending diagrams and photos of his.

Hey, @joelorigo, would you be able to share the battery-only mod info? Thanks!

 

[tcpoint]

Nice graphics. How does it sound?

 

[jjjimi84]

Hey, @joelorigo, would you be able to share the battery-only mod info? Thanks!

What you would want to do is leave out ic1, c5 and c6. You could also skip the 1n5817. Then you would connect the battery snap opposite, red terminal to ground and black to positive.
Also you will need to jumper pins 5 and 8 where ic1 would be.

 

[piapium]

What you would want to do is leave out ic1, c5 and c6. You could also skip the 1n5817. Then you would connect the battery snap opposite, red terminal to ground and black to positive.
Also you will need to jumper pins 5 and 8 where ic1 would be.

why do we do this? is it the original design or to use with battery? I have one and I could give it a try.

 

[jjjimi84]

why do we do this? is it the original design or to use with battery? I have one and I could give it a try.

That is to use a battery. The sunflower is using +9 supply and using ic1 changing it to -9 supply which is what the circuit requires.
Some feel that overdrives and fuzzes sound better with batteries. Specifically really cheap dollar store batteries

 

[benny_profane]

If the diode is removed, there is nothing protecting the circuit from reverse polarity. It's really easy to accidentally touch the terminals of the battery connector backward. There should be some method of polarity protection (diode in series, parallel, MOSFET, etc.).

 

[jjjimi84]

If the diode is removed, there is nothing protecting the circuit from reverse polarity. It's really easy to accidentally touch the terminals of the battery connector backward. There should be some method of polarity protection (diode in series, parallel, MOSFET, etc.).

Flip the 1n5817 around

 

[joelorigo]

Hey, @joelorigo, would you be able to share the battery-only mod info? Thanks!

Yes, I will go back and read the process Is was advised and sent you a private message in a little while

 

[joelorigo]

Nice graphics. How does it sound?

It sounds really good!

 

[joelorigo]

why do we do this? is it the original design or to use with battery? I have one and I could give it a try.

The reason I wanted to do it was because it’s based on the Analogman Sunface and his uses a battery only, and no IC. There’s lot of information on his Sunface page.

 

[joelorigo]

If the diode is removed, there is nothing protecting the circuit from reverse polarity. It's really easy to accidentally touch the terminals of the battery connector backward. There should be some method of polarity protection (diode in series, parallel, MOSFET, etc.).

Good to know, I will be careful when changing the battery. Thanks

 

[joelorigo]

Hey, @joelorigo, would you be able to share the battery-only mod info? Thanks!

Oh, this thread is where it all started for me

SOLVED - Sunflower Fuzz

Hello, is it possible the Sunflower Fuzz to work only with a 9v battery without IC and external power supply? I would like to use the sunflower with PNP 2SB178 transistors. What changes are required? Omit C5,C6 and IC Jumper D1,jumper fron pin 8 to pin 5 Am I missing anything?

forum.pedalpcb.com

 

[piapium]

Can you compare it to the version with ic? And why pedalpcb designed it with ic? Copyright issues? I am going to do this mode. Is it true to analogman design? Do I need to change transistors too?

 

[joelorigo]

I can not. Maybe someone else on the board can.
I am curious however and was thinking of building one with no mods to compare.

 

[benny_profane]

The IC in this circuit is a voltage inverter and allows the use of a standard power supply (and daisy chaining). There is no impact on the audio path. This is a positive ground effect; most effect circuits are negative ground. By removing it and using battery power, you're simply reversing the polarity of the battery to provide a positive ground, but it also means that the effect cannot be powered alongside other effects via daisy-chaining.

 

[caiofilipini]

Thank you all for the details!

 

[piapium]

The IC in this circuit is a voltage inverter and allows the use of a standard power supply (and daisy chaining). There is no impact on the audio path. This is a positive ground effect; most effect circuits are negative ground. By removing it and using battery power, you're simply reversing the polarity of the battery to provide a positive ground, but it also means that the effect cannot be powered alongside other effects via daisy-chaining.

If there is no effect on the audio path it is a useless mod for me.