Do not use a 7400 or 74LS00 chip (as some people suggest) for a This is used as a replacement for the discontinued MC3459Ĭhip at U15 on the MPU board (a 74LS37 can be used in a pinch, but is This chip frequently goes bad on the MPU board. Resides in the "corrosion area".Īvailable from Jameco (part# LM555CN, $0.29) or Radio Shack. Have at least one good one around.Īvailable from Jameco (part# 43481, $1.95). Get either and have a few around.Īvailable from Jameco (part# 43596, $2.49). No cost difference between 25 and 35 amps). 25 amp bridges work just fine too (but usually there's But I've also seen "1001" which isġ0 amps at 100 volts. Bridge Rectifiers: keep a few 35 amp, 200 volt (or higher) bridge.Note the 1N959B is mis-labeled in the manual as "1N9598". ![]() This can be replaced with a 1N4738A diode (8.2 volts, 1 watt).Ī 1N4739A (9.1 volts) can be used too, as this would hold the RESET line low RESET line low for a short time while the power supply and its associated filter capacitor
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