Omitting battery snap = ok to omit 10k resistor ?



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Omitting battery snap = ok to omit 10k resistor ?

Postby hangwire » Sat Mar 30, 2019 10:08 am

Image

I am going to finally get around to building a dirt pedal a friend gave me the parts for... see pic above and the yellow circled area.

Can I just omit the 10k resistor and battery clip totally, or does that 10k “balance” something and I should wire it as shown even if I never use a battery with it?

Thanks! I’m good at guitar wiring but have been unsuccessful often with pedals so like getting the advice/guidance.
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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby hangwire » Sat Mar 30, 2019 10:12 am

Sorry not sure why that cropped

Here:
http://oi66.tinypic.com/2h4yr6o.jpg

[
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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby crochambeau » Sat Mar 30, 2019 11:24 am

No, you want the 10K resistor between Vcc (+ battery) and the collector of your transistor or you'll wind up with no signal as the resistor is what facilitates the voltage drop that becomes your output signal. Simply wire the positive lug of your DC connector to the point at which the battery is drawn.

The messily depicted part between the solder together node and the output jack is a capacitor, if using a polarized electrolytic, you will want the positive side facing the transistor.
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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby BetterOffShred » Sat Mar 30, 2019 11:25 am

Yeah me and Curtis were typing at the same time;)
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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby crochambeau » Sat Mar 30, 2019 11:33 am

BetterOffShred wrote:Yeah me and Curtis were typing at the same time;)


:lol:

Usually you are far quicker on the draw than I
D.o.S. wrote:This thing is like the Blue Box on the amount of acid that lands you in the ER pretending to play it straight while you try and ignore the fact that the walls are dripping oil.


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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby hangwire » Sat Mar 30, 2019 11:36 am

Thank you! Depending on space In the enclosure might just have to wire it with the battery snap as drawn otherwise I’ll need to start running longer wires to the jacks and mounted stuff... but if not I’ll just throw that resister in the dc jack path.

If that sentence shows misunderstanding of what you suggested in what you posted, thank you in advance for correcting me
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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby eatyourguitar » Sat Mar 30, 2019 7:50 pm

no rc low pass filter on your noisy DC supply :poke:

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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby hangwire » Sun Mar 31, 2019 12:19 am

eatyourguitar wrote:no rc low pass filter on your noisy DC supply :poke:

Image
unfortunately I understand only 10% of everything you posted/ drew
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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby BetterOffShred » Sun Mar 31, 2019 12:29 am

He's Indicating doing what is shown creates a low pass filter for the power with that 220 load resistor. It's a good idea and will quiet a circuit. If you don't understand that drawing you should spend some time looking at schematics and paying attention to the power supplies. You'll see a lot of similar things. :)
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Re: Omitting battery snap = ok to omit 10k resistor ?

Postby eatyourguitar » Mon Apr 01, 2019 8:49 am

here is a website that will explain it better than my little crap doodle. this is probably the MOST important lesson you will ever learn related to understanding and modifying filters, tone knobs, EQ, and noiseless power supplies. it is a very very simple concept of what you can build with one capacitor and one resistor and no active components. the only other lesson you need to read is on a transistor gain stage. that is literally all there is in a guitar pedal.

https://www.electronics-tutorials.ws/filter/filter_2.html

https://www.electronics-tutorials.ws/transistor/tran_2.html
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