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October 31, 2014, 01:15:07 PM
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DIYstompboxes.com  |  Projects  |  IC-based Overdrive  |  IC Pin 3 Voltage ??? 0 Members and 1 Guest are viewing this topic. « previous next »
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Author Topic: IC Pin 3 Voltage ???  (Read 3542 times)
ohhmygod
Posts: 3


IC Pin 3 Voltage ???
« on: October 06, 2008, 02:09:50 AM »

Hello,

I tried t o assemble the circuit as the tutorial. Everything is fine, except the voltage into pin 3 is amazingly low.
I got around 3 V into pin 3, for other pins they are normal. I dont know what is happening. Please help

Thank you.
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ohhmygod
Posts: 3


Re: IC Pin 3 Voltage ???
« Reply #1 on: October 07, 2008, 02:35:20 AM »

My values:
VA =9.63V
VB= 4.76V

Battery:9.66V
Pin:
1 0V
2 4.49V
3 3.25V[!]
4 0V
5 0V
6 4.82V
7 9.64V
8 0V

I have checked the resistors values :-/
100 = brown black brown
22k = red red orange
470k = yellow violet yellow
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Zben3129
Posts: 1023

Zach B.


Re: IC Pin 3 Voltage ???
« Reply #2 on: October 07, 2008, 04:59:19 AM »

Check the value of r2, should be 10k (brown black orange), and r1, should be 2.2m (red red green)



Zach
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ohhmygod
Posts: 3


Re: IC Pin 3 Voltage ???
« Reply #3 on: October 07, 2008, 07:57:23 PM »

yep, r2 is brown black orange. r1 is red red green.
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