Hard to say but I’d think not, they’re in parallel not series. So the position should not have an effect unless there’s something really bizarre about the distribution board. But that’s not impossible.
You could use a scope to look at the rail voltages at the TL071. Maybe even a multimeter if the fluctuations are slow enough.
It might be that you’re trying to draw too much current from your power supply, but then it should affect other modules as well.
Where did you buy the TL071?
It might be helpfull if you show (a schematic of) how you wired up the TL071 and how it gets its power.
Hello, thanks for your replies.
Here’s the schematic.
So far I get rid of the op-amp buffer as it is totally unstable.
It might be a bad soldering or a bad DIP socket.
I will find time sometime to investigate more with a multimeter
Is the output of the MCP a signal centered around GND? In other words, does the MCP produce AC or is there a DC offset? If there is a DC offset, try to link the opamp to the MCP via a 10uF (or similar) capacitor (+ side connected to the MCP if you are using an elco), to free the output from the DC.
If you distrust the TL071, then try to hook it up as a TL072. I once bought some TL071’s that appeared to contain 2 opamps instead of the one it ought to have. Luckily they used the TL072 layout and the 2 individual opamps worked fine.
One last comment from me, often fluctuations happens because of floating ground issue. In your schematic you have of lots of connections to the ground.
Here’s a very simple op amp tester circuit. It does nothing to characterize the performance of the device, just tests if it functions as an amplifier or not.
And of course it uses DIP sockets, so maybe make sure you’re confident of your sockets before building one!
Wow that’s great !
Thanks !
I had this problem too.
In the new version just posted d13 has a 10k resistor to ground and the switch goes to 5v
Gonna try this. Wonder if theres a code change needed tho
Could voltage drops/note changes be caused by using the arduino 5v regulator for the mcp4725?
I contacted YMNK on YouTube, he had changed the Arduino code a bit and since then everything has been working for me, including the B grade! Thanks again to YMNK!
I created a “nice” design for my module system with LED indicators!
…I had to change a few little things to adapt to my stripboard so that it worked in the end. I roughened the black dip switch caps with sandpaper, then painted them with acrylic artist paint and varnished them with transparent nail polish
Very nice!!! Let’s hear it !
