D
Deleted member 148505
D
Deleted member 148505
D
Deleted member 148505
Like my other works, I believe the layout is 100% accurate.
Attached the layout and gerber file. The PDFs and the GERBERs are free for all
Hi
I hope someone can organise a group buy for the pcb
Thanks for the nice work .
regards
kp93300
How much power?
To drive 0.5R sensibly, the rails would have to be MUCH lower, different output devices as Rds on of 0.5R is too high and reduce the output source resistors to 0.1R or less
This topology works well into low Z loads as it can swing close to rail to rail
Please check my build
Hi,
I'm building the GB150D and while I wait for the amplifier pcb's to arrive I started building the power supply section.
I'd like to ask you if my build looks safe and robust. I'm particulary worried about the transformers connection to the soft-start board and the on-off switch wires.
Does it looks fine?
I attach some pictures.
Thanks!
Hi,
I'm building the GB150D and while I wait for the amplifier pcb's to arrive I started building the power supply section.
I'd like to ask you if my build looks safe and robust. I'm particulary worried about the transformers connection to the soft-start board and the on-off switch wires.
Does it looks fine?
I attach some pictures.
Thanks!
Attachments
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Do,
Are you going to use the zener mod or the RCR? Wich one do you choose and why?
Zener noise maybe be a concern (not sure if it's audible) and the capacitor across the zener can be raised to 10uF to mitigate this.
The RCR mode, in the other hand ,has no zener but only works if the preamplifier impedance is lower than 800 Ohms. May pick some RF noise.
Both mods simulate to a 20dB higher PSRR which is equivalent of 10 x more supply capacitance.
One note about the value of R2:
With the zener mod R2 should be 925 Ohm - Z preamplifier.
With the RCR mod R2 should be 800 Ohm - Z preamplifier, typical 750 Ohms.
Ciao!
Paulo.
Are you going to use the zener mod or the RCR? Wich one do you choose and why?
Zener noise maybe be a concern (not sure if it's audible) and the capacitor across the zener can be raised to 10uF to mitigate this.
The RCR mode, in the other hand ,has no zener but only works if the preamplifier impedance is lower than 800 Ohms. May pick some RF noise.
Both mods simulate to a 20dB higher PSRR which is equivalent of 10 x more supply capacitance.
One note about the value of R2:
With the zener mod R2 should be 925 Ohm - Z preamplifier.
With the RCR mod R2 should be 800 Ohm - Z preamplifier, typical 750 Ohms.
Ciao!
Paulo.
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Just to let you know that they now have partial kits with matched input/out BJT/MOSFET
Mosfet 150W Power Amplifier GB150D Partial KIT Matched Input OUT BJT Mosfet | eBay
Ciao!
Do
Mosfet 150W Power Amplifier GB150D Partial KIT Matched Input OUT BJT Mosfet | eBay
Ciao!
Do
Not sure yet. I will check this after I'm finished with my current amp build.
Ciao!
Do