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 Post subject: Passive Autofire Circuit
PostPosted: Mon Nov 16, 2020 6:08 pm 

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Joined: 28 Sep 2020
Posts: 24
Looking for further guidance on this from someone who has built one of these circuits before or with more electronics knowledge than myself. I am building one of these to use in an arcade stick now and then to transfer into a control panel in the future as button mashing just isn't a fun aspect of shmups for me.


I ordered all the components from the circuit diagram as shown above. The resistors I ordered were 1K Ohm 1/8W. But now they have turned up and I have the benefit of seeing their relative scale they are tiny compared to the resistor shown on the images on the example board below. This image shows a 1K ohm resistor (Brown, Blacck) x Red = 10 x 100 Ohm = 1k Ohm. But there is no indication of the wattage.


Before I start ordering more resistors (I now have 20 of the 1K Ohm 1/8W as this was minimum order, lol) can these be used? If not what Wattage should I get I'd guess the one shown on the baord is 0.5w or 1w based on the relative size but I cannot imagine it needs to be any higher for the signal level in a joystick?

Thanks (as ever) to anyone who takes the time to read and help out :D

P.S. For the benefit of anyone that may know/have spotted/or cares I conceded that this version with a second 100uF capacitor on pin 4 from the hex inverter won't be as good as the 470nF version but I didn't want to have loads of spare capacitors lying around from having to do minimum orders of each. If it really isn't that great I can always swap out the caps in the future. I already now have surplus resistors :roll:
WelshMegalodon wrote:
Both of those run just fine in MAME 0.222, pal. Maybe the problem is your shit-tier hardware.

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 Post subject: Re: Passive Autofire Circuit
PostPosted: Mon Jan 11, 2021 10:34 pm 

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Joined: 26 Jan 2005
Posts: 376
Is it possible to order a passive autofire circuit like this from an online vendor? Want to plug one into a Raiden cab. Thanks

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