@Andrewlebon, making a complete high power amplifier is more costly than just a amplifier board.
I wont be building any high power amplifier from now on you can a china FP10000q clone $700 + custom duty
Good parts comes from Imported and Mumbai foreign post customs over-charged me 3000inr on those 2 Nippon capacitor and 5000inr on those 2 amplifier board. India customs are gone mad on Chinese goods.
I wont be building any high power amplifier from now on you can a china FP10000q clone $700 + custom duty
Good parts comes from Imported and Mumbai foreign post customs over-charged me 3000inr on those 2 Nippon capacitor and 5000inr on those 2 amplifier board. India customs are gone mad on Chinese goods.
Last edited:
Dear, Friend
Problem:
I build a 2pic Class AB Amplifier with only 1 secondary from Toroidal Transformer
You get a humming noise when turn the volume up when i connect to 1 source which share the same Input GND
what input circuit is required for this?
Problem:
I build a 2pic Class AB Amplifier with only 1 secondary from Toroidal Transformer
You get a humming noise when turn the volume up when i connect to 1 source which share the same Input GND
what input circuit is required for this?
That's a classic ground loop. Some model Quad amplifier (403?) had a similar problem.
You can try breaking the ground connection at one channel's amplifier input, or connecting it via 10 ohms or 100 ohms in parallel with 10 nF or so. Should work alright. I'd also recommend joining the grounds at the input jacks, then the cable shield of that side doesn't go floating with no cable connected.
You can try breaking the ground connection at one channel's amplifier input, or connecting it via 10 ohms or 100 ohms in parallel with 10 nF or so. Should work alright. I'd also recommend joining the grounds at the input jacks, then the cable shield of that side doesn't go floating with no cable connected.
Mr. sgrossklass
I did 10nf 50nf 80nf with 10ohms, 100ohms, 220ohms, and the hum sound still not stop.If you run Each channel with different source then there is no sound. It is a hum sound only when you raise the volume and as you increase the volume the hum gets louder.
As it is using only 1 secondary for 2 amplifier channel which share the same filter Capacitors
How do i reduce this hum noise from running from 1 source?
or
How can you get 2 input gnd from one source?
I did 10nf 50nf 80nf with 10ohms, 100ohms, 220ohms, and the hum sound still not stop.If you run Each channel with different source then there is no sound. It is a hum sound only when you raise the volume and as you increase the volume the hum gets louder.
As it is using only 1 secondary for 2 amplifier channel which share the same filter Capacitors
How do i reduce this hum noise from running from 1 source?
or
How can you get 2 input gnd from one source?
Dear, Friends
Still cannot solve the hum problem. please kindly share your inputs
When you touch both the amplifier board input GND together you get a hum sound. The hum sound decrease when the volume pot is centered. It get's louder when the pot is turned all the way down or all the way up.
Also if we use 5ohms resistor on 1 amplifier board input gnd the hum sound get louder on that 1 channel. And the other channel which has no resistor has no hum.
Still cannot solve the hum problem. please kindly share your inputs
When you touch both the amplifier board input GND together you get a hum sound. The hum sound decrease when the volume pot is centered. It get's louder when the pot is turned all the way down or all the way up.
Also if we use 5ohms resistor on 1 amplifier board input gnd the hum sound get louder on that 1 channel. And the other channel which has no resistor has no hum.
Last edited:
- Status
- Not open for further replies.