anythingcansoundgood
Member
Hello!
I initially posted this in an old thread (here: https://groupdiy.com/threads/my-gssl-variable-scale-meter-board.30057/#post-1171342), but since I didn’t get any replies, I thought I’d try again here. Please let me know if this isn’t the right place for this question!
I’m working on building a simple LED-based GR meter for a GSSL compressor. I want the scale to be fixed at 20 dB.
I came across information suggesting that the current output for the meter is negative. Is that correct?
If that’s true, I assume I’ll need an inverting op-amp configuration. My question is: with the same inverting buffer circuit, could I amplify the signal by 2.5x to bring it to a 0–5V range? If so, would I then be able to use the circuit from page 2 of the LM3914 datasheet (https://www.ti.com/lit/ds/symlink/lm3914.pdf) directly?
Here’s a schematic to clarify what I mean (the IC shown is the LM3914):
As my V+ and VLed source, I would be using the +12V output of the 78L12 voltage regulator (already in the GSSL's circuit).
Thanks!
I initially posted this in an old thread (here: https://groupdiy.com/threads/my-gssl-variable-scale-meter-board.30057/#post-1171342), but since I didn’t get any replies, I thought I’d try again here. Please let me know if this isn’t the right place for this question!
I’m working on building a simple LED-based GR meter for a GSSL compressor. I want the scale to be fixed at 20 dB.
I came across information suggesting that the current output for the meter is negative. Is that correct?
If that’s true, I assume I’ll need an inverting op-amp configuration. My question is: with the same inverting buffer circuit, could I amplify the signal by 2.5x to bring it to a 0–5V range? If so, would I then be able to use the circuit from page 2 of the LM3914 datasheet (https://www.ti.com/lit/ds/symlink/lm3914.pdf) directly?
Here’s a schematic to clarify what I mean (the IC shown is the LM3914):
As my V+ and VLed source, I would be using the +12V output of the 78L12 voltage regulator (already in the GSSL's circuit).
Thanks!
