I don't know about any "official" zener version, but the RC filtered CCS design posted here has issues if the rails vary very much at dc
Hi Andrew,
It looks like it was taken from Greg's website from pages reserved for customers who bought the amp. When I built mine several years ago I recall following similar instructions that were posted on the owners page.
PJN
It looks like it was taken from Greg's website from pages reserved for customers who bought the amp. When I built mine several years ago I recall following similar instructions that were posted on the owners page.
PJN
Thanks for the info Mike.
However, the schematic in post #31 from Greg Erksine does not show the updated RCR values and PauloPT confirms in post #30 that the RCR mod replaced the Zener mod. So should one assume that the updated RCR mod enables easier stabilization of the amp, measures better (PSRR) and sounds better as well? ....just logical ramblings, because I am interested in designing a single sided PCB and building. Thanks.
However, the schematic in post #31 from Greg Erksine does not show the updated RCR values and PauloPT confirms in post #30 that the RCR mod replaced the Zener mod. So should one assume that the updated RCR mod enables easier stabilization of the amp, measures better (PSRR) and sounds better as well? ....just logical ramblings, because I am interested in designing a single sided PCB and building. Thanks.
RCR does nothing to stabilise the CCS if the mains input varies or if the power supply sags over several seconds under load.
There is no point going crazy over this though, as the mosfet current still varies with supply even if you hold Vgs rock solid
There is no point going crazy over this though, as the mosfet current still varies with supply even if you hold Vgs rock solid
If the supply is sagging that much over that long of a time frame you've got other things to worry about than the CCS.
Really, class AB amp supplies have poor regulation as the load current range is so large.
Add in mains swinging from 250V down to 230V when all the air cons go on and you need a stiff CCS
Add in mains swinging from 250V down to 230V when all the air cons go on and you need a stiff CCS
Member
Joined 2009
Paid Member
Many countries are relaxing their rules on voltage and frequency stability of the mains supply these days to cope with too much unpredictable "green power"
In Malaysia power demand in hosing areas peaks in the evening, when people go home and turn their air cons on, drawing heavy load until the rooms have cooled down.
The distribution system was not built for the load and this makes the supply at the wall socket unstable
In Malaysia power demand in hosing areas peaks in the evening, when people go home and turn their air cons on, drawing heavy load until the rooms have cooled down.
The distribution system was not built for the load and this makes the supply at the wall socket unstable
D
Deleted member 148505
My first iteration for the PCB design for this amp. 🙂
I am still aligning the labels hence no component name/values.
PCB size is exactly 3.35 x 3.85 inches
Less than 10x10cm so that pcb manufacturing will be cheap
I am still aligning the labels hence no component name/values.
PCB size is exactly 3.35 x 3.85 inches
Less than 10x10cm so that pcb manufacturing will be cheap
Attachments
Last edited by a moderator:
D
Deleted member 148505
D
Deleted member 148505
Second iteration using GDS pinout.
I've also made it to be TO-220 compatible. In case there is.
I've also made it to be TO-220 compatible. In case there is.
Attachments
Last edited by a moderator: