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EL CHEAPO BILL OF MATERIALS DESCRIPTION COMMENTS
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U1 Q1 Q2 CR1 CR2-CR5 C1 C2, C4 C3 R1 R2, R5 R3-R4 R6 J1 J2 U2 U3 P28 P40 PCB Power PC interface cable DB-25M to DB-25M
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78L12 2N7000 N-Channel MOSFET 2N3906 5.1V, 0.5W Zener 1N914 silicon diodes 10 uF electrolytic 0.1 uF 0.01 uF 220 , 0.5W Any silicon diode can be used in this circuit 16 V Any type of capacitor can be used Any type of capacitor can be used Note Zetex Modi ed TO-92 package output in Fig. 4.28 Labeled 3906 in Fig. 4.28
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10K, 0.25W 1K, 0.25W 330 , 0.25W Digi-Key part number: SX1152-ND
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2.5 mm power socket DB25-F PCB mount socket 18-pin DIP socket 14-pin DIP socket 14-pin SIP socket 40-pin DIP socket
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Can be a ZIF socket Use 3M TextTool P/N 218-3341-00 0602R Can be a ZIF socket Use 3M TextTool P/N 214-3341-00 0602R Can be cut down from a 28-pin DIP socket See text regarding socketing options
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The power supply must source at least 250 mA; output must match J1 Straight-through parallel port switch cable; see text
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and one poor soul who used his PC s 5V and 12V power supplies and ended up burning them out because he didn t know what he was doing. The circuit I ve shown here can take a lot of abuse, and if too much current is drawn, the 78L12 will shut down to protect you and the circuitry it is connected to.
PROGRAMMING PIC MICROCONTROLLERS
The second subsystem in this programmer is the Vpp control circuit consisting of the dual transistor switch of Q1 and Q2. Q1 controls a zero to a 13.4V signal that controls the PNP transistor at Q2. This circuit probably seems a bit unwieldy and unnecessarily complex, but Vpp will require up to a 50 mA source to program EPROM parts. This circuit will switch the 13.4V of regulated voltage and allow the maximum current supplied by the 78L12 to be passed to the PIC microcontroller being programmed. The RC delay circuit (consisting of R3, R4, C3, and CR5) is used to provide an external delay to the PC for programming the PIC microcontroller. The delay itself is on the order of 100 s. Five volts are provided by the El Cheapo s power supply and are controlled by pin 14 of the PC s parallel port. The RC network will delay the action and allow the PC to poll the error (pin 15) line of the parallel port to get a (relatively) constant delay that is independent of the PC s operating speed and internal architecture. I found that the RC network did perform its designed function but the (relatively) long RC delay made it impractical for use in timing the programming operation of the chip. Similarly, the circuit could not be used to practically time the number of cycles the PC s processor could execute in a given amount of time due to different operating system requirements and variances in timing of the processor execution. As I gained more experience with the circuit and more people tried it out, I found that it really couldn t be used for providing a stable timing reference for the programmer and I stopped using it. The last subsystem in the El Cheapo is the PIC microcontroller socket and programming data pins. In Fig. 4.28, I showed just an 18-pin PIC microcontroller socket. As can be seen in Fig. 4.29, there are actually three sockets, which allow the programming of ve different pin-through-hole (PTH) PIC microcontroller con gurations.
Silkscreen overlay for the El Cheapo PCB.
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Figure 4.30 Bottom side copper pattern for the El Cheapo PCB.
The PCB design is shown in Fig. 4.29 and Fig. 4.30. Figure 4.29 is the overlay, indicating where parts are to be placed on the board and their orientation. Figure 4.30 is the bottom side copper pattern used on the board, and the lettering on it is the mirror image of what is going to be displayed, because the stencils made for the PCB are made from the top down. When you look at the actual PCB that came with the book, all the lettering on it will be readable (without using a mirror). The circuit is quite easy to assemble on the PCB, but there are a few comments that I want to make. First off, this is a single-sided board. In order to layout the board without any jumpers on the top side, there are some traces between 0.100in parts and between the transistors outside pins. When you are soldering in the components be careful that the traces between their pins are not shorted to the pins. Next, there are three or ve polarized components. Make sure the transistors and the 78L12 regulator are inserted properly. If you buy Zetex Modi ed TO-92 package transistors, remember that the at side with the labeling should match the at side on the PCB s overlay silkscreen. Note that the parallel port socket is female and the cable connecting the El Cheapo to your PC is a DB-25 male to DB-25 male straight-through cable. Do not use a male socket on the El Cheapo and a DB-25 male to DB-25 female cable this will reverse the pins going into the programmer and it will not work. The sockets used for the 8, 14, and 18 PIC microcontroller positions can either be standard DIP sockets or ZIF (zero insertion force) sockets. The holes in the PCB are large enough to support ZIF sockets and I recommend that you use them. I realize that
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