I have completed a 19.6v speaker build. Audio quality is great. It has a voltmeter with a built in USB charger.
If I use a bluetooth receiver with independent power connected to the amp audio is great. As soon as I try and power the bluetooth receiver from the same battery that powers the amp, I get very loud static/noise.
I know one answer is separate power supplies, but this is not practical. Is there another was I can prevent this interference when sharing power?
If I use a phone or tablet and power that from the speaker there is no interference. Only when I use a bluetooth adapter (I've tried a couple). I have a pre-amp coming and assume that will also have the same issues when sharing the power supply with the amp.
If I use a bluetooth receiver with independent power connected to the amp audio is great. As soon as I try and power the bluetooth receiver from the same battery that powers the amp, I get very loud static/noise.
I know one answer is separate power supplies, but this is not practical. Is there another was I can prevent this interference when sharing power?
If I use a phone or tablet and power that from the speaker there is no interference. Only when I use a bluetooth adapter (I've tried a couple). I have a pre-amp coming and assume that will also have the same issues when sharing the power supply with the amp.
How is it you get 5V (or whatever the BT receiver uses) from 19.6?
My Zoudio class D amp has that same input voltage and an integrated BT receiver. I dont know how the small signal power voltages are derived, but I believe there's 3.3 and 5V within that board - and these come from the main power input - somehow.
A "pre-amp" could easily connect directly to the 19.6V supply, not requiring typical single cell lithium consumer product voltages like a BT module is most probably designed to use. Maybe this discrepancy has something to do with it and the "pre-amp" board wont exhibit the problem.
My Zoudio class D amp has that same input voltage and an integrated BT receiver. I dont know how the small signal power voltages are derived, but I believe there's 3.3 and 5V within that board - and these come from the main power input - somehow.
A "pre-amp" could easily connect directly to the 19.6V supply, not requiring typical single cell lithium consumer product voltages like a BT module is most probably designed to use. Maybe this discrepancy has something to do with it and the "pre-amp" board wont exhibit the problem.
I am using an external 5v Bluetooth adapter. The voltmeter is designed to run on 12-24v and is used to replace a cigarette lighter in a vehicle. So it downrates the voltage to 5v usb. When connected to any other 5v charger there is no issue.
I have also ordered a Bluetooth adapter that will run on 19.8v.
I have also ordered a Bluetooth adapter that will run on 19.8v.
Use a 5v isolator module to run the Bluetooth module, it's really the easiest way to solve this problem & they are pretty cheap. Search your preferred auction site for B0505S.
Thanks. Everything in my system will be working on 19.8v including the Bluetooth module I will be using. Is there a higher voltage equivalent? I can only find at 5v.
I have also found this but have no idea how it works or if it will actually degrade sound quality at the same time.
Ground Loop Noise Isolator Anti interference Safe Accessories Clear Sound Car Audio Aux With 3.5mmCable Home Stereo Portable|Speaker Line| - AliExpress
I have also found this but have no idea how it works or if it will actually degrade sound quality at the same time.
Ground Loop Noise Isolator Anti interference Safe Accessories Clear Sound Car Audio Aux With 3.5mmCable Home Stereo Portable|Speaker Line| - AliExpress