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|16th November 2005, 07:39 PM||#72|
Join Date: May 2004
Here are all the optimasations Algar_emi recommended:
There is no real errors but things that can be improve before you go on
One of my goal was to have a one side PCB, 4X6 inches lenght max because
I wanted to use a 9X6 one side PCB.
So, the things to improve are:
-The transfo on the PCB VA rating is a little to low to supply directly
outboard fans. I recommend to use a slightly bigger transfo, such as the
MT2228-ND, 18V, 0.7VA instead of the 0.34VA I used. You'll need to
increase slightly the dimension od the PCB to accept the bigger transfo
and chnage the transfo pins location, or as I taught to do, make
provision on the PCB to accept both transfo. You may be able to fit the
bigger traansfo by rearrange this section of the PCB.
-J1 & J2 are connectors that I got from a surplus store. You are better
to replace them from connectors that you can get from digikey, such as
nice little Molex connectors such as the Digikey WM5824-nd (this is a 3
pins conn, you need a 4 pins and maybe a little bigger, but you got the
-J2 is not well located, the others parts around are too close, so J2 is
kind of difficult to plug in, get some more room around it.
-U2 is too close to D1. You need to install a DIP socket to plugin U2.
Bring U2 more to the right of the PCB
-RLY4 is a little to close to the screen mounting hole. You may move the
PCB right side of the PCB to get some more air on the right section of
-U3 is really close to Q1, again move the right side a little bit to the
-Add an other piin hole for maybe an smaller dimension and or type of
capacitor for C35, as I did with C34 (optional)
-You may add 0.1uF, decoupling cap for U2 and U3 on the supply pins. I
was planning to add them from under the PCB if needed.
-A last request, if you get a silkscreen option, would you right my name
in full on the PCB along with the copyright?
|8th December 2005, 09:53 PM||#74|
Join Date: May 2004
Although I like this design, I myself have decided not to go further with this design.
I have started designing something similar but very different.
I hope to have a working prototype in a few months.
|30th October 2007, 01:29 AM||#75|
Join Date: May 2003
Hi guys, think im 2 yrs late on this thread... Just a short question: where should we insert the Standby switch on the Aleph circuit? I understand it should be somewhere around Q3 on the main board?
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