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Posts posted by HarryA

  1. What you need is a notch filter to remove only a narrow band of unwanted  frequencies . There are pedal notch filters on the market but they are pricey. Search on "guitar notch filter pedal".

    Also see::  https://lambdageeks.com/notch-filter/#:~:text=A notch filter%2C also known as a frequency,while allowing other frequencies to pass through unaffected.

    About half way down the page he covers guitar pedals.

    If you wish to make one perhaps I could help you with it.


  2. When a post is made the forum software often displays key technical words in the post description. This would suggest that one could use that software to detect post that are legitimate from others. Of course the the devil is in the details. Invision's Zendesk maybe open to support on something like this as it would also be to their benefit.  When I had a forum (Simple Machine's software) I spent a lot of time mutilating the software to get what I wanted.

  3. If it interest you, I could program the micro-controller for you.  That would give you an introduction to micro-controllers. The micro-controller is about 21$, a LCD  about 13$, You would need a 9 volt battery, a battery connector, a battery to micro_controller connector, and a switch also.

    An assortment of colored wire would be helpful. Plus a plastic or metal box to pack it all into.

    If you are checking your cables near a computer you could uses the computer as a simple display device instead of the LCD.

    LCD : https://www.amazon.com/SunFounder-Serial-Module-Arduino-Mega2560/dp/B01GPUMP9C/ref=sr_1_1_sspa?adgrpid=1335907194272933

    Micro-controller: https://www.amazon.com/ELEGOO-ATmega2560-ATMEGA16U2-Arduino-Compliant/dp/B01H4ZDYCE/ref=sr_1_2_sspa?crid=1L06F0IP302BX&keywords=Arduino+R3+Mega2560&qid=1684882151

    wire: https://www.amazon.com/TUOFENG-Hookup-Wires-6-Different-Colored/dp/B07TX6BX47/ref=sr_1_3?keywords=colored+wire+spool&link_code=qs&qid=1684885902&sourceid=Mozilla-search&sr=8-3


  4. No, just simply add a capacitor to the  AOUT  terminal  ahead of the speaker from your board.  Can you trace pin 5 of the LM386 directly to the AOUT terminal ?

    There may or may not be a small capacitor and resistor connected to pin 5 also.

    UPDATE: It look like the board already has an output capacitor. The yellow  227C is a 220 microfarad capacitor. So you do not need to add one. see:  https://www.ebay.com/itm/391354402991?mkevt=1&mkcid=1&mkrid=711-53200-19255-0&campid=5338766894&toolid=20006&

    Just connect your speaker to the output terminals.


  5. It looks like  the unit you have is designed to work with a high impedance load like the input to the Arduino. Typically for  a LM386  driving a 8 ohm speaker a 220 to 250 microfarad capacitor is used with the negative lead to the speaker.  Try adding one to your unit. see the circuits here:




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