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DT001 Rev C -

DT001 SimmStickTM Motherboard, Power Supply and Programmer Parts List.

Specifying Component Values - International Variations:
It is hard to please everyone when it comes to international standards, as in many cases, there isn't one.
Where you see a resistor with a value of 4K7, this means 4.7K, or 4 thousand 7 hundred ohms.

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POWER Input Components, and Programmer Voltage:
Plug-pack (Wall Wart) 9 to 12 volts AC or DC at 100ma to 300ma. The current required to run a minimal DT001 board is very small. Larger configurations will require larger capacity power supplies.

If you wish to use the board as a Cheap PIC Programmer, then the 13V VPP needs to be generated by supplying enough voltage to drive the VPP circuit.

This means using an input voltage of around 16V DC or 12 V AC. If a 9 to 12 V DC Plug Pack is used, it can be wired up in conjunction with a 9V Battery to generate the +13V VPP programming voltage. Two batteries could be wired together for a portable unit.

Don't go too high with the input voltage as you may go over the 7805 specs and heat up the device to destruction. I would suggest that 18 Volts is as far as you should go. Provision for a heat sink is made on the board at the 7805 location.

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Main Board Components - all options:

1 x DT001 Printed Circuit Board      
1 x 7805 +5 Voltage regulator in TO-220 case.
1 x Suitable heat sink for above Regulator.
1 x Diode Bridge D1 WO2 (or WO4 type)
2 x 1N4004 Diodes. D1 and D2. For 13V VPP.
1 x 2.1mm DC Input plug. PCB mount.
Provision is also made for screw terminals at .2" centers.        
1 x Capacitor C1 1000uf Electrolytic @25 Volts (PCB type mount)
Board will fit larger caps: eg those with .3", .4", or 
0.5" centers, or 1000uf, 2200uf or 4700uf.        
1 x Capacitor C2 .01uf (or .1uf) Ceramic
1 x Capacitor C3 .01uf (or .1uf) Ceramic
1 x Capacitor C4 10uf Electrolytic/Tant. (PCB mount.) @16 V.
1 x Capacitor C6 .01uf (or .1uf) Ceramic
1 x Capacitor C7 .01uf (or .1uf) Ceramic
1 x Resistor R1 1K8 .25 watt Red LED 1 (PWR. Overlay Shows 4K7)
1 x Resistor R2 330 .25 watt Green LED 2 (+5V)
1 x 5mm Red LED. LED 1 PWR monitor
1 x 5mm Green LED. LED 2 +5V monitor
4 x 12mm square .5" stick on rubber feet. Adds a nice finish.
2 x 1N4148 Small Signal Diodes. D3 and D4. 
    Used for Basic Stamp Comms.

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Programmer Parts: 

1 x E1           7407
1 x 78L12        +12 Voltage regulator in TO-92 case.
1 x Capacitor    C5  10uf Electrolytic/Tant. (PCB mount.)@25V.

1 x RN1 10K resistor network. 6 pin device, 1 common pin. 
Extra holes so that a 7 or 8 pin device can be fitted. 
(6P5R-10K)

1 x Resistor     R3  4K7  .25 watt Red LED 3 (VPP On)
1 x Resistor     R4  1K8  .25 watt Green LED 4 (VDD On)
1 x Resistor     R5  100K .25 watt Q2 cct.
1 x Resistor     R6  100K .25 watt Q1 cct.
1 x Resistor     R7  10K  .25 watt Q1 cct.
1 x Resistor     R8  10K  .25 watt Q2 cct.
1 x Resistor     R9  100  .25 watt Q2 cct.
1 x Resistor     R10 10K  .25 watt Clock Pullup.
1 x Resistor     R11 10K  .25 watt Data Pullup.
1 x Resistor     R16 1K   .25 watt VPP Pulldown.

1 x 5mm Red LED.   LED 3 VPP monitor
1 x 5mm Green LED. LED 4 VDD monitor
1 x 4 Pole Double Throw (4PDT) Switch. Run/Load
1 x DB-25 Male right angle PCB mount connector.
2 x Transistors  Q1 & Q2  BC558. Most PNP Small Signal will do.

US Transistor types 2N4403 can be used, but you'll need to 
position the devices at 180 degrees to the overlay as shown. 
This means the flat side of transistors Q1 and Q2 will both 
be facing towards the 78L12 regulator.
It also means you will have to bend the center leg slightly in 
the opposite direction.

Check out: ftp://wirz.com/Simm_Stick/dt001.pdf for more details on the 2N4403 transistor.

  • 1 by 10 pin IDC type Male header. (2 by 5 pins) J1 Program Header. (optional, for target boards with matching headers.)
  • 1 by 18 pin ZIF or Machine Pin Socket. (Optional)

NOTE **** If you choose not to use a ZIF socket in the on-board position, at least make sure you install a reasonable quality machine pin socket into this position. Instructions can be found on how to fit a ZIF socket in the Hardware Hints file.

18 pin ZIF sockets are very hard to find. TEXTOOLS (green) have an 18 pin ZIF, but the local importers require a minimum order of ten before they will import them, so these are flown in, but normally they are in stock at all times.

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If you wish to connect to a target board with a matching 10 pin header:

1 by 6 inches of 10 wire flat ribbon cable with two 10 pin IDC crimp headers, one crimped each end. No, you can't buy it. You will need to make this cable up and crimp it yourself. A small vice works nicely for crimping these IDC connectors. If you can't find headers as small as 10 pin, you may have to use a larger size. These can often be easily cut down, or simply placed pin 1 to pin 1 on the existing headers.

Pair of Female 10 pin IDC crimp headers. (To suit the above)

I'LL JUST REPEAT THAT. SIX INCHES OF FLAT RIBBON CABLE, NOT THREE FEET.

Three feet of DB-25M to DB-25F printer port cable works fine. Yes, it's pin for pin, so an off the shelf fully wired cable will do. Or you can crimp your own. I think a foot to 18 inches will do for this job.

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RESET and BOOT Switches:

A Reset can be added for CPU control, and I have also included a "BOOT" switch on the SDA signal. If a pull-up resistor is fitted on a SimmStickTM module, then this line can be used as a single line switch input. I added it mainly for FED Basic "COMMS" control.

1 x Resistor     R14 330  .25 watt Boot Button.
1 x Resistor     R15 330  .25 watt Reset Button.
2 x Suitable switches.
These can be the pretty plastic color ones with .2" centers, 
or mini 4 pin TACT switches that have a .2" by .3" pattern.

The smaller 2 pin device can also be used, however as the board artwork connects to only diagonal pads, a short jumper would need to be done to each switch on the solder side of the board.

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SimmStickTM Bus Expansion. J3

1 x 30 Pin single row right angle Female connector for Motherboard.
1 x 30 Pin single row right angle Male connector for expansion board.
Straight Pins are also available from DonTronics and their Dealers.

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DonTronics Relay Bus:
1 by 34 pin IDC type Male header. (2 by 17 pins) J2
Mates with the DonTronics Relay Board.

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Enabling Serial RS232 Communications:

1 x Resistor     R12  1K  .25 watt for RX monitor LEDs.
1 x Resistor     R13  1K  .25 watt for TX monitor LEDs.
1 x Resistor     R17  2K2 .25 watt for BS-2 Comms Config.
1 x 5mm Red LED.   LED 5 RX Plus monitor
1 x 5mm Green LED. LED 6 RX Minus monitor
1 x 5mm Red LED.   LED 7 TX Plus monitor
1 x 5mm Green LED. LED 8 TX Minus monitor
1 x MAX-232 E2 (or equivalent)
4 x 1uf Electrolytic or Tantalum Caps for Max-232. C8 to C11.
1 x DB-9 right angle PCB mount connector.

It's a good idea to use a 16 pin socket for the Max-232, as you may have to remove it for some configurations.

Please Note **** If you are building the DT001 just as a programmer, you don't need everything installed. In fact, if you install the MAX-232 chip, the programmer section may not work at all, as this is a development platform and has many features.

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SimmStickTM Bus

A variety of options here. You can use single or dual 30 Pin Simm Sockets. These can be placed at intervals required by the user. The PCB holes are placed at .15" centers, and standard Simm Sockets are made for .3" centers, so many different layout patterns can be utilized.

If you needed two sockets that were an inch apart because of a ZIF socket or other board options that increase the height of the SimmStick, then .9" or 1.05" spaced selections can be made.

A combination of Vertical, 27 degree, and Horizontal sockets may make for interesting combinations.

You don't need sockets either. A row of female pins could be added so that SimmSticks with male pins fitted, could be plugged into the female pin headers.

To fully populate the bus, you will need:
  4 x Dual 30 pin Simm Sockets (Vertical) with .3" centers.

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