Any experience with floating ground in the F5turbo?
Had a huge hum problem with 2 channels at the input. With only one nothing at all. Solution must be a little resistor in the gnd in?
Jims Pcb
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Had a huge hum problem with 2 channels at the input. With only one nothing at all. Solution must be a little resistor in the gnd in?
Jims Pcb
Have you tried the PSU / grounding suggested by NP for the f5 turbo?
Please note the different symbols used for the chassis ground/Safety Earth/PE and the PSU power ground/PSU zero volts.
This is important.
Note also that the secondary centre tap goes directly to the first capacitor pair.
having got those bits wired correctly it becomes important to minimise the loop areas of the charging circuits to minimise the EMI.
This is important.
Note also that the secondary centre tap goes directly to the first capacitor pair.
having got those bits wired correctly it becomes important to minimise the loop areas of the charging circuits to minimise the EMI.
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Why are you doubling up the hard-wiring of the smoothing caps?
Bring the rectifier in at one end. Take the power out at the other end.
Eyvind this is what I call "bus"
Gnd enclosure
As my backplate is not metal I could have a problem with electrical connection of the enclosure parts. I'll connect the two heatsinks at the backplate with a copper 2 cm wide and ground my input to that trough 10 ohm and a capacitor. Do you think that's an idea? ? I can't post pictures even that I have paid Diyaudio 20 dollars for membership.
As my backplate is not metal I could have a problem with electrical connection of the enclosure parts. I'll connect the two heatsinks at the backplate with a copper 2 cm wide and ground my input to that trough 10 ohm and a capacitor. Do you think that's an idea? ? I can't post pictures even that I have paid Diyaudio 20 dollars for membership.
Don't post pictures........... I can't post pictures even that I have paid Diyaudio 20 dollars for membership.
Attach them !
How to attach images to your posts.
And registration here is free.
View attachment 632963
If only one channel is connected to Pre it is ok.
Ahhhh, the hum breaking resistors... this seems to come up again and again with the F5. There were a few posts about modifying the diyAudio boards to add those resistors. Try searching for it.
And how do you stop the loop formed by the two stereo ground wires?Probably not needing the hum breaking resistors, but a solid and even ground potential.
By having an extremely low-impedance and low resistance ground. The easiest way to try it is attach ALL (including the signal input grounds) to one point on the PSU ground. Star-grounding is a common name for it.
Do this. Attach the speaker negatives and the input signal negatives to it as well. (Yes, the input from the RCA to the PCB will only be the positive!) The only ground connection from the amplifier boards will be the one wire attaching V+/gnd/V- to the PSU.
An externally hosted image should be here but it was not working when we last tested it.
Do this. Attach the speaker negatives and the input signal negatives to it as well. (Yes, the input from the RCA to the PCB will only be the positive!) The only ground connection from the amplifier boards will be the one wire attaching V+/gnd/V- to the PSU.
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