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Sallen Key Low Pass Filter, bandpass filter

bertus

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Nov 8, 2019
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Hello,

When you place the parts in the same way as the other filters, it would be as easy as making a copy.
The only difference will be component values.
The coloured wires should look the same for every filter.

Bertus
 

Maglatron

Jul 12, 2023
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yeah thats whats puzzling its identical to the other 3 same with the bar graph drivers may get time on the project later and see if I can see something I missed yesterday
 

Maglatron

Jul 12, 2023
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HOORAH :)
so I missed a joint on the envelope detector of the 4h filter, soldered the power for the LM3914 bar graph driver into the wrong place and hardest to find was acctually a cold solder joint on the 2.2k resistor 1/4 done, 3/4 left!!! but as promised here are a couple pics:
 

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Last edited:

Maglatron

Jul 12, 2023
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so I'm going to expand to the left and right and above the LED display on more protoboard the same size as the two I've used and I've added in another TL074 for the REF GND's for the remaining filters and LM3914 bar graph driver circuits! thanks
 

Maglatron

Jul 12, 2023
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so I'll be resuming as soon as possible and get more updates for you guys as I go along! thanks
 

Maglatron

Jul 12, 2023
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attached another board and soldered in some 18 pin sockets, run out, so ordered some more going to get started on the filters soon!
 

Maglatron

Jul 12, 2023
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UPDATE fully made the 5th filter and envelope detector going to solder up the bar graph LED driver for the 5th column as soon as I get a chance! thanks
 
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