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Incorrect voltages on op amp
4 años 9 meses antes #1886
por LdCmd
Incorrect voltages on op amp Publicado por LdCmd
So I have just finished building the pedal shield MEGA have only tested a few effects distortion, delay, tremolo but I don't think they are pronounced enough, and there is also some noise, so I started trouble shooting. The MEGA is an original Arduino board.
First check voltages
The voltages were ok at the onboard measurements points, and at conn5 (~3.7V) and OLED screen voltages was ~5V, screen and buttons (checked with program) work ok. There is one place where the voltages are not the same as in the trouble shooting guide. On the op amp the voltage on pin 5,6,7 should be between 2.1 - 2.5 but in my case they are pin 5 = 1.42V, pin 6 = 2.92V, pin 6 = 2.87V I'm powering it of a 9V battery. I have looked at the resistors and they are placed correctly.
Also adjusting the RV1 doesn't seam to have any effect...
Anybody have a suggestion where I should look?
First check voltages
The voltages were ok at the onboard measurements points, and at conn5 (~3.7V) and OLED screen voltages was ~5V, screen and buttons (checked with program) work ok. There is one place where the voltages are not the same as in the trouble shooting guide. On the op amp the voltage on pin 5,6,7 should be between 2.1 - 2.5 but in my case they are pin 5 = 1.42V, pin 6 = 2.92V, pin 6 = 2.87V I'm powering it of a 9V battery. I have looked at the resistors and they are placed correctly.
Also adjusting the RV1 doesn't seam to have any effect...
Anybody have a suggestion where I should look?
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