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The AC mains is stepped down by transformer X1 to deliver 30V, 250 mA from the secondary. The address and data for the EPROM (ZIF SOCKET) are set by using DIP switches SW1 and SW2, respectively, whose pins are initially pulled high via 10-kilo-ohm resistors. The programming voltage required for an EPROM is sometimes written on its body. Before applying the programming pulse to the EPROM, select the programming voltage (25V, 21V or 12.5V, as specified by the manufacturer) applied to pin 21 of the ZIF SOCKET by using jumper J1. LED1 glows to indicate the application of the programming pulse to the EPROM. EPROM is inserted into the ZIF SOCKET for programming. When push-to-on switch S1 is pressed, IC2 generates a 50ms pulse, which is given to the program pin 18 of the ZIF SOCKET through switch S2. The circuit uses timer NE555 (IC2) wired as a monostable.
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