hey guys,
I am currently working on a final project for my university studies and I am running into a bit of trouble. I am using a 741 Op-Amp to amplify the signal from an electric guitar, which in return is fed into a LM2917 Frequency to Voltage converter (necessary for PIC 16F microprocessor). Now here is the problem, according to the LM2917 datasheet, the accuracy of the voltage output depends on the values of capacitor 1 and resistor 1. I have spent hours trying to figure it out but either I get a very inaccurate output with the voltage constantly changing or I get a precise output but which is capped at 8V with the components used on the schematic. I would greatly appreciate the help as I am getting close to complete frustration :S
The circuit is powered with 9V
The description for finding R1 and C1 is found on page 7. I understand the calculations and the process but I think I might do something else wrong that I am not aware of.
LM2917 Datasheet:https://www.electro-tech-online.com/custompdfs/2011/03/LM2907.pdf
Thank you very much for any advice in advance
Phil
I am currently working on a final project for my university studies and I am running into a bit of trouble. I am using a 741 Op-Amp to amplify the signal from an electric guitar, which in return is fed into a LM2917 Frequency to Voltage converter (necessary for PIC 16F microprocessor). Now here is the problem, according to the LM2917 datasheet, the accuracy of the voltage output depends on the values of capacitor 1 and resistor 1. I have spent hours trying to figure it out but either I get a very inaccurate output with the voltage constantly changing or I get a precise output but which is capped at 8V with the components used on the schematic. I would greatly appreciate the help as I am getting close to complete frustration :S
The circuit is powered with 9V
The description for finding R1 and C1 is found on page 7. I understand the calculations and the process but I think I might do something else wrong that I am not aware of.
LM2917 Datasheet:https://www.electro-tech-online.com/custompdfs/2011/03/LM2907.pdf
Thank you very much for any advice in advance
Phil
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