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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Can I substitute a 74HC75 for a 74LS75?
Actually I have done it and it is working, but can it be expected to
last? Or should I order some LS's and install what was originally in it? If it matters, it's being used on a video arcade game mother board, Ms Pac-Man to be specific. Thanks, Tony |
#2
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Can I substitute a 74HC75 for a 74LS75?
On Dec 10, 12:18*pm, Tony Miklos wrote:
Actually I have done it and it is working, but can it be expected to last? *Or should I order some LS's and install what was originally in it? If it matters, it's being used on a video arcade game mother board, Ms Pac-Man to be specific. Thanks, Tony CMOS chip inputs must be tied hi or low so that they don't drift into linear mode pull excess current and get hot. Any unused input that is NOT connected should be tied to + 5. Unconnected output pins can be ignored. You may run into quirks if they were pushing to the edge of the clock speeds. An HCT chip has the input thresholds more closely matched to TTL and may work better. G² |
#3
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Can I substitute a 74HC75 for a 74LS75?
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