Hi Rich;
I have 10 which give readings between 3.81 up to 3.96 if they are of use to you.
Keith
I have 10 which give readings between 3.81 up to 3.96 if they are of use to you.
Keith
Now for the really stupid Question ....
Zener diodes have a black end and a red end ... am I correct in believing that the black end is to be soldered so the white line on the PCB is beneath the black ... ?
This is possibly the dumbest question ,but I have never been told or read about this.
Please advise ... this is my third set of boards HELP
thanks , Rich
Zener diodes have a black end and a red end ... am I correct in believing that the black end is to be soldered so the white line on the PCB is beneath the black ... ?
This is possibly the dumbest question ,but I have never been told or read about this.
Please advise ... this is my third set of boards HELP
thanks , Rich
Hi all
Rich, I'm back from vacation on the 02/01 and if you need some help with you amp let me know so we can arrange something ( like a nice afternoon around you bench ).
Ric
Rich, I'm back from vacation on the 02/01 and if you need some help with you amp let me know so we can arrange something ( like a nice afternoon around you bench ).
Ric
Hi,
the symbol for a diode is a triangle and a bar across the tip.
The arrow of the triangle points in the direction of conventional current flow.
The bar matches the black bar on the device.
If you want current to flow and for the diode to drop Vf then the triangle points to negative.
If you want to block current flow then the triangle points to the positive.
The black bar on the PCB is the same black bar as on the symbol, which is also the same black bar on the device.
the symbol for a diode is a triangle and a bar across the tip.
The arrow of the triangle points in the direction of conventional current flow.
The bar matches the black bar on the device.
If you want current to flow and for the diode to drop Vf then the triangle points to negative.
If you want to block current flow then the triangle points to the positive.
The black bar on the PCB is the same black bar as on the symbol, which is also the same black bar on the device.
Thank You
Hi Andrew,
thank for that ....
Ric ,
that afternoon you have offered is a must ... I took 8 hours to solder one board, being careful not to burn solder ,cleaning the tip before each joint , checking the values twice ,only having one value on the bench at any one time , the once over with a magnifying glass.
I dont understand the grounding ... I measure the DC across speaker outs and get - 2.760 vdc without ground the amp board to the chassis. When I connect ground I get 28.07 vdc .
Im not going to give up . Im looking around for beginners courses on the web. Im going to be off work for another year at least and this seems like a worthy endeavour .
Its kind of like try to un-ravel a ball of fishing line washed up on the beach .
Finding the starting point is the key ....😕
Rich
So , in reply to your offer .... YES PLEASE ..
Hi Andrew,
thank for that ....
Ric ,
that afternoon you have offered is a must ... I took 8 hours to solder one board, being careful not to burn solder ,cleaning the tip before each joint , checking the values twice ,only having one value on the bench at any one time , the once over with a magnifying glass.
I dont understand the grounding ... I measure the DC across speaker outs and get - 2.760 vdc without ground the amp board to the chassis. When I connect ground I get 28.07 vdc .
Im not going to give up . Im looking around for beginners courses on the web. Im going to be off work for another year at least and this seems like a worthy endeavour .
Its kind of like try to un-ravel a ball of fishing line washed up on the beach .
Finding the starting point is the key ....😕
Rich
So , in reply to your offer .... YES PLEASE ..
Gents ,
I have been through everything with a meter checking continuity and it all checks out perfect ...
It is the way Im wiring the boards ,specifically the grounds .... ?
Rich
I have been through everything with a meter checking continuity and it all checks out perfect ...
It is the way Im wiring the boards ,specifically the grounds .... ?
Rich
How about next weekend ?
I'm driving back to the UK tomorrow so next Saturday I can get to you around lunch time with some tools (signal gen/scope...).
PM me from tomorrow with your contact/address.
Happy new Year to all
Ric
I'm driving back to the UK tomorrow so next Saturday I can get to you around lunch time with some tools (signal gen/scope...).
PM me from tomorrow with your contact/address.
Happy new Year to all
Ric
Well , New Year celebration .... I finally got my amp working !
Now I need to set up the biasing ...
Left Channel @ PSU = 56.1 vdc
@ SP = - 010.2 mV
Right Channel @ PSU = 55.9 vdc
@ SP = -101.4 mV
Can someone help me please ?
Thanks , Rich
Now I need to set up the biasing ...
Left Channel @ PSU = 56.1 vdc
@ SP = - 010.2 mV
Right Channel @ PSU = 55.9 vdc
@ SP = -101.4 mV
Can someone help me please ?
Thanks , Rich
Congratulations
Have you checked the output offset after about 1 hour operation ?
If not do it because it can change with the mosfet temperature.
You can fine tune the offset current on your right channel (check the schematic for that).
Why are your readings negative (-10.2mV and -101.4mV )?
Ric
Have you checked the output offset after about 1 hour operation ?
If not do it because it can change with the mosfet temperature.
You can fine tune the offset current on your right channel (check the schematic for that).
Why are your readings negative (-10.2mV and -101.4mV )?
Ric
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Hi Ric,
the offset is leveling out ...
L = 44. 7 R = 66.7 , both + vdc
Right 500r trimmer wont go any higher . I was advised to get more heat into the Fets .. What the 100k trimmer for ?
R
Ps I have ordered new trimmers !
the offset is leveling out ...
L = 44. 7 R = 66.7 , both + vdc
Right 500r trimmer wont go any higher . I was advised to get more heat into the Fets .. What the 100k trimmer for ?
R
Ps I have ordered new trimmers !
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To help you with that you have to tell me what diagram/schematic you used because on the original Aleph 30 schematic the change is done replacing 2 resistors (1 for the offset and 1 for the idle current).
Ric
Schematic
Hi Ric,
R8 220 R , R13 47.5k . I set the values the same on the trimmers before mounting them .
Hi Ric,
R8 220 R , R13 47.5k . I set the values the same on the trimmers before mounting them .
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