Talk:ProDev DDT
Please post your support questions here and ReActiveMicro or someone from the Community will be glad to assist you!
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
Questions
1) 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?
2) Please confirm where these capacitors should be located as the photo is not clear:
C1: 10 25v small green bulb
C14: *7501 brown bulb
3) The photo shows transistor, but I did not receive one in my kit. What is the part number of this?
4) WRT the socket at B1. Is the top left pin, connected to second pin by a trace on the back of the board?
>Henry from RM:
1 - 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?
2 - C1 bottom left corner of the PCB, below LS09, 10uF. C14 is top right, above DDT2, 1uF.
3 - 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.
4 - The LS109, and correct. It looks like Pin15-16 are connected.
Hope this helps!
1) 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?
2) 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 ?
3) Thanks. I'll pick one up locally.
4) 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.
>Henry from RM:
1 - >Is there an equivalent part that this could be used instead of?
The part technically isn't required for the board to work. It's only for power filtering. Almost any bypass cap can be used. I'd recommend the more common .1uF in case you don't have them.
1 - >at which location?
Here is a pic of the top silk layer with all the location markings and values. However a bypass cap will always be connected to an ICs power and ground pins. If that's not the case, then it's some other kind of cap.
>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 ?
Yes the 10 5v green bulb cap sounds to be 10uF. I'd need to see a pic to be 100% sure, but the "10" sounds like a 10uF marking. Sorry to report, I have no idea what the brown bulb would be. I would need to see a pic of it to be sure. Perhaps once you build the board there will be one spot leftover and by process of elimination you will find the location.
Hope this helps!