den_vom_moersch
New member
Hi,
so I finished my Mini Heterodyne Receiver built. And here is my Problem.
There is always a strong noise that overlays everything.
I traced the signal path and found that the signal gets more and more distorted in the first three stages of IC2 (CD4069UBM). After the third stage of IC2 the noise is so loud, even without an input signal attached. I think that is not the way the pedal should respond after the videos I watched.
I have already checked the values of the components and the solder joints.
Can it be due to the carbon layer resistors or have I fried the IC2?
Why does it produce this noise on its own without an input signal?
What is the purpose of the three stages in series?
Ive measured the voltages on the first three ICs.
Vref = 9V
IC1
1: 4.16
2: 4.16
3: 4.16
4: 0
5: 3.6
6: 4.16
7: 4.16
8: 8.3
IC2
1: 3.85
2: 3.85
3: 3.85
4: 3.85
5: 3.79
6: 3,80
7: 0
8: -
9: -
10: -
11: -
12: -
13: -
14: 8.3
IC3
1: 3.8
2: 5.8 - 6.5
3: 4.0 - 5.0
4: 3.4 - 3.8
5: 0
6: -
7: 0
8: 8.3
9: 0 - 3.5
10: 0 - 8.3
11: -
12: -
13: -
14: 8.3
Thanks in advance, maybe someone can support me getting rid of the noise or whatelse I could check.
so I finished my Mini Heterodyne Receiver built. And here is my Problem.
There is always a strong noise that overlays everything.
I traced the signal path and found that the signal gets more and more distorted in the first three stages of IC2 (CD4069UBM). After the third stage of IC2 the noise is so loud, even without an input signal attached. I think that is not the way the pedal should respond after the videos I watched.
I have already checked the values of the components and the solder joints.
Can it be due to the carbon layer resistors or have I fried the IC2?
Why does it produce this noise on its own without an input signal?
What is the purpose of the three stages in series?
Ive measured the voltages on the first three ICs.
Vref = 9V
IC1
1: 4.16
2: 4.16
3: 4.16
4: 0
5: 3.6
6: 4.16
7: 4.16
8: 8.3
IC2
1: 3.85
2: 3.85
3: 3.85
4: 3.85
5: 3.79
6: 3,80
7: 0
8: -
9: -
10: -
11: -
12: -
13: -
14: 8.3
IC3
1: 3.8
2: 5.8 - 6.5
3: 4.0 - 5.0
4: 3.4 - 3.8
5: 0
6: -
7: 0
8: 8.3
9: 0 - 3.5
10: 0 - 8.3
11: -
12: -
13: -
14: 8.3
Thanks in advance, maybe someone can support me getting rid of the noise or whatelse I could check.
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