Firstly, the final product shows two IC's plus various components. Also, the same is shown over jammaarcade.net. However, the bill of materials lists out 4 IC's, which I believe are sub-"modules" in the same IC's?:
[INDENT] [h=3]Martin Jones wrote:[/h]
- IC1B is a monostable which triggers on every sync pulse, generating a pulse 4.7 microseconds long. These become the new horizontal sync pulses.
- IC2B combined with D1, R3 and C3 form a sync separator which triggers the monostable in IC1C only on sync pulses which are longer than about 40 microseconds.
- IC1C is a monostable which generates vertical sync pulses about 200 microseconds long.
- IC2E combines the new horizontal and vertical sync pulses into a new sync signal.
[/INDENT]So as for the 1st questions:
- IC1B and IC1C are simply the same IC, a 74LS221, correct?
- IC2B and IC2E are simply the same IC as well, a 74L86, correct?
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