MS20 Filter on Stripboard LED question

[fredrik]

@THOGRE

Where can I see which voltage has to be where?

Looks like @Dud has already identified the issues, but I posted an annotated stripboard here, with the supply lines and voltages marked out:

Annotated Simple Low Pass Filter Stripboard

I did some scribbles on top of the LMNC low pass stripboard layout, showing what’s inside the chips, where the power rails are, what voltages to expect on the supply pins, etc. Posting it as new topic to make it easier to link to it [image] See here for the annotated Simple 1V/Oct Oscillator stripboard.

(measure the voltages from ground to the pin, and make sure you have both the right voltages and the right polarity)

To find the supply pins more generally, use google to find the datasheet, locate the right pinout, and look for pins named VCC, VEE, or similar. For example, the TL074 datasheet is here and it has the following drawing:

Note the pins named VCC+ and VCC−; they’re the positive and the negative supply for this package. The negative supply is sometimes named VEE or VSS, and the positive supply can also have multiple names, and sometimes the chip wants a GND too; you may have to look at the pin descriptions to figure out what’s what. If you stumble upon some datasheet where it’s not clear, the people on this forum can help.