JDM2 based PIC Programmer

Step 2 Construction

The traces in this design are nice and fat for easy toner transfer (or lazy photo boards). I started making PCB with the TT method, but found it pretty tedious. A $10 investment got me started with photo PCBs (using ink jet transparency positives). I will never go back.

All the parts were available at my local electronics shop in Amsterdam, though I ordered the parts from Mouser in bulk. Each board cost about $2.50 to make - the greatest expense was the 9 pin female DB9 connector ($1.60).

Layout and BOM are below. Schematic and board files are for EagleCad. Don't forget the 8 jumpers, shown in red.

Part Value

C1 100uF/25V
C2 22u/16V Tantal
C3 22...47...100pf
C4 22...47...100pf
D1 1N4148
D2 5V1 Zener
D3 1N4148
D4 1N4148
D5 1N4148
D6 8V2 Zener
D7 1N4148
IC1 DIL18S
IC2 DIL28-3
IC3 DIL40
Q1 BC547B
Q2 BC547B
R1 10k
R2 1k5
R3 100ohm
R4 1K
R5 15K
SV3 Pin Header (3)
X1 Female DB9 9-pin connector (F09H)

Comments

[efdat]

please tell me the soft ware you use to draw your pcb circuits

[MicRoelelectronica]

nice thingy maar er is toch iets wat ik niet begrijp C3 en C4, welke waardes moet je hebben? i dont quite know how to say that in english.

[ian]

Any of those values should work. Kies een van de waardes.

[curioussole]

Why do none of the part lists ever include the wattage on the resistors? Are they 0.5W or 1/4Watt? Don't diodes and capacitors also have wattages? Why are the full specs on the parts not listed?

[ian]

Everybody assumes 1/4watt if not specified.

[Germanach]

stupid character format support 8o)

[Germanach]

The chip can handle 10mA MAX.
In VCC you have: V=I.R and P=I.V => R.I^2=P
The smaler resistor is 100 Ohm, and the Max current is 10mA, so max power needed
could be:
Pmax=Rmin.(Imax)^2=100.(10m)2=10mW, this is less than 1/8W (125mW), so 1/4W should be ok for all.