EPROM Emulator
a perfect imitation-EPROM
Materials
Gerber file
CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD members can exclusively download these files for free as part of their membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service.
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Component list
R1,R2,R5,R6 = 10k?
R3 = 33?
R4 = 100?
R7,R8 = 1k?2
R9 = 8-way SIL array 10k?
Capacitors:
C1-C4 = 100nF
Semiconductors:
D1 = zener diode 7.5V
D2,D3 = zener diode 4.7V
D4 = LED, high-efficiency, yellow
D5 = LED, high-efficiency, red
T1 = BS170 or BS107
IC1 = 78L05
IC3 = 62256-70CP
IC4 = GAL 16V89, programmed, order code 024066-31
IC5 = 74HCT245
Miscellaneous:
IC2 = 2 ? 14-way pinheader
S1,S2 = pushbutton
K1 = 9V battery clip with leads
PCB, order code 024066-1
Disk, GAL JEDEC listing, order code 024066-11
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