### Author Topic: IC Pin 3 Voltage ???  (Read 6702 times)

#### ohhmygod

##### IC Pin 3 Voltage ???
« on: October 06, 2008, 04:09:50 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.

#### ohhmygod

##### Re: IC Pin 3 Voltage ???
« Reply #1 on: October 07, 2008, 04:35:20 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

#### Zben3129

##### Re: IC Pin 3 Voltage ???
« Reply #2 on: October 07, 2008, 06:59:19 AM »
Check the value of r2, should be 10k (brown black orange), and r1, should be 2.2m (red red green)

Zach

#### ohhmygod

##### Re: IC Pin 3 Voltage ???
« Reply #3 on: October 07, 2008, 09:57:23 PM »
yep, r2 is brown black orange. r1 is red red green.