SOLVED Simple boost not working on breadboard (LPB-1 and Shur's Dooster Booster)

[zelcanada]

Brand New member here

I've been working with Sascha Surh's book and tried to make this boost:
Except when I breadboard it, I get no sound. I've checked all my parts, and even rebuilt it, but still no sound. Pot has no effect.

I thought maybe I was misunderstanding some fundamentals, so I went and built the treble booster from Coppersound's website and it worked great. I can't figure out why it's not working!!

I also watched the first episode of Josh's Short Circuit (JHS) and couldn't get the LPB-1 to work either. It's similar to this circuit, so maybe there's something simple I'm missing? Clearly my breadboard is okay because the treble boost worked

I tried to measure the voltage from the collector of the transistor, because from what I understand, it should be 4.5V, but when I connect my meter from ground to collector, it reads just over 9V.

I don't know if this is enough info to help me



I'm pretty sure all my directional components are placed properly. My caps are for sure, and I'm pretty certain my transistor is placed properly.

This is my first experiment with my breadboard. I really like the prospect of designing my own circuits and Surh's book, coupled with JHS live streams has really been awesome at helping me understand some basics, but clearly I'm missing something.

I would really appreciate any help/advice!

Cheers

 

[Feral Feline]

Welcome to the PPCB forums!


Please confirm the colour-bands on your emitter:
GREY RED BLACK BLACK BROWN = 820Ω — if you've GREY RED BLACK BROWN BROWN then your Transistor won't switch on (8k2).

Likewise, confirm the collector resistor's colours, hard to see as the light's not great, but LOOKS like you have:
WHITE BROWN BLACK WHITE BROWN = 910GΩ
WHITE BROWN BLACK GREY BROWN = 91GΩ
WHITE BROWN BLACK SILVER BROWN = 9Ω1

Should be:
WHITE BROWN BLACK BROWN BROWN = 9k1


Ahhh, that could be it...

https://www.digikey.ca/en/resources/conversion-calculators/conversion-calculator-resistor-color-code

 

[zelcanada]

First off, thanks for replying. I'm hoping these forums are going to be useful as I get into this world of circuitry!

So the colours in my picture must not be showing well... What you're seeing as white is grey or sometimes even orange... But your reply encouraged me to go back and recheck all my resistors. Using a multimeter, I realized that my 9.1 kΩ resistor was actual a 9.1 Ω resistor! I swapped it out and now it's working!

Thanks for your help!