Talk:ProDev DDT: Difference between revisions

Latest revision as of 21:00, 25 July 2023

Please post your support questions here and ReActiveMicro or someone from the Community will be glad to assist you!

Here is a pic of the top silk layer with all the location markings and values.

Parts list and locations

Capacitors

C1 10 25v small green bulb
C6 471 flat brown
C14 *7501 brown bulb
C16 & C18 221 flat brown x2
C19 22uf 50v electrolytic can
All other C positions: 104 tantalum cap x12

Resistors

R4 & R10 Brown Black Brown 100 ohms x2
R9 Brown Black Red 1k
All other R positions: Brown Black Orange 10k x7

Other

Q1 2N3904 Transistor (Not needed for IIgs version)
DDT1 DM74S287N
DDT2 DM74S571N

Questions

Is there a build instructions somewhere? The technical folder includes photo of a required wire... This should be called out elsewhere somehow because I had no idea it was necessary from looking at the main wiki page.

@@ Line 1: / Line 1: @@
 Please post your support questions here and ReActiveMicro or someone from the Community will be glad to assist you!
+Here is a pic of the top silk layer with all the location markings and values.
+<gallery class="left" widths=450px heights=250px>
+File:2022-10-03_-_ProDEV_DDT_-_Silk_Layer.png
+</gallery>
 ==Parts list and locations==
@@ Line 17: / Line 22: @@
 ===Other===
-Q1 2N3904 Transistor
+Q1 2N3904 Transistor (Not needed for IIgs version)<BR>
+DDT1 DM74S287N<BR>
+DDT2 DM74S571N<BR>
 ==Questions==
-) I received a larger green capacitor with markings 2A104J but I have no idea where it should go as I don't see this in the photo. Is this really part of the kit? If so, where does it go?<br />
+Is there a build instructions somewhere? The technical folder includes photo of a required wire... This should be called out elsewhere somehow because I had no idea it was necessary from looking at the main wiki page.
-) Please confirm where these capacitors should be located as the photo is not clear:<br />
-C1: 10 25v small green bulb <br />
-C14: *7501 brown bulb<br />
-) The photo shows transistor, but I did not receive one in my kit. What is the part number of this?<br />
-) WRT the socket at B1. Is the top left pin, connected to second pin by a trace on the back of the board?<br />
-<hr>
->Henry from RM:<br />
-- 2A104J would be a 104 / .1uf / 100nf cap. Checking my kits I don't see any parts like that. I wonder if this is from an older kit?<br />
-- C1 bottom left corner of the PCB, below LS09, 10uF. C14 is top right, above DDT2, 1uF.<br />
-- Odd. Checking a kit and I see Q1 in it. Sorry about this issue. PN: 2N3904. Let me know if you need to order one and the cost and I can refund that to you.<br />
-- The LS109, and correct. It looks like Pin15-16 are connected.<br />
-Hope this helps!<br />
-<hr>
-) This is likely an older kit. The writing on the PCB is not as complete WRT component values as the picture on the wiki. Is there an equivalent part that this could be used instead of? at which location?<br />
-) I know where the locations are, I am not clear on what component should be used in these locations. Is the 10 5v green bulb cap 10uF ? is the *7501 brown bulb uF ?<br />
-) Thanks. I'll pick one up locally.<br />
-) Thanks. I wasn't sure and tried to suck excess solder off between the pins and lifted the mask. I'll reflow and test for continuity.<br />