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  1. D

    is this bjt transistor hbridge right?

    Yes. But transistor drive depends on what yiou use for top and bottom devices, NPN, PNP, both..... And dont forget you need deadtime switching, eg. no vertical par simultaneously on...
  2. D

    CMOS??

    Lastly the tolerance on Alum Electrolytics, look at the tolerance column : Regards, Dana.
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    CMOS??

    Showing me high accuracy ..... Please do, link to cap data sheet you are using ? Must be a little pricy if high accuracy..... Regards, Dana.
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    4017 ?

    The closed mind thing you like accusing me of, if I recall I gave you in another post several docs on the 555 Timer to add to your library. That must be the act of a closed minded person apparently in your world. I stand corrected, I am guilty as charged. Regards, Dana.
  5. D

    CMOS??

    The initail tolerance, at room T, on Alum Electrolytics +/- 20% or worse, most offerings. Many Alum Electrolytic datasheets dont even spec T dependency, its so bad. Check it out. Then we have this to add on due to T effects, from Vishay or whoever : So doing the math here due to initial...
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    4017 ?

    With the zest you have for more knowledge I know of a chip that is effectively its own protoboard. Here is whats in it (for open minds) : In many cases multiple copies of them. And you can wire it up internally and or out to pins. Enjoy. Regards, Dana. PS : Whats that old accurate phrase...
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    CMOS??

    ""it was said ", oh ya, thats a great factoid. Who said it, what background shipping info did he/she gather, form what vendors......when..... Regards, Dana.
  8. D

    CMOS??

    Now this is what I call serious accuracy (LMC555) : And guess what, thats for a precision ideal timing cap placed on it. Let me know where I can get some of those :) Initial accuracy with an electrolytic at just room T probably around +/- 50%. Dont hear of too many 555 timers in space...
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    CMOS??

    If you dont care about that its a great chip to use. But if you want a 21'st century timer, to do something like this, it sucks. https://www.electro-tech-online.com/articles/pulse-sequence-generator-smart-timer.938/ You can do that with vacuum tubes, but I would advise against it. You would...
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    4017 ?

    The micro suggestion is just that, a suggestion, not your enemy. I encourage people to work at their own pace, from their own experiences, for their own joy. Especially if its a one off hobby activity. Forum contributors have an implied responsibility, to show current technology and whats...
  11. D

    CMOS??

    Following may be of interest, attached : If you want sophisticated timer solutions : https://www.electro-tech-online.com/articles/pulse-sequence-generator-smart-timer.938/ Regards, Dana.
  12. D

    4017 ?

    If you do not know how to program consider getting into block programming. Here you could use a Nano Board, 2-3 dollars, to do the design. Here is the block [programming. Right hand window you drag and drop blocks into it and configure them, like what pin to set / clr, mBlock is the free...
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    PSoC1 CY8C26443 lying around. Should I throw them away?

    As stated in earlier post PSOC Designer includes a compiler. PSOC Miniprog was main programmer interface from USB : Your board looks like it also took the miniprog versus parallel as an option, eg. the 5 pin header. But w/o any docs on your board I would be careful, trace out, if using a...
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    PSoC1 CY8C26443 lying around. Should I throw them away?

    PSOC 1 saw enormous volumes in consumer low end products. Its mixed signal capability far superior in the market place. Still has a market for low cost mixed signal designs. But PSOC 4, 5LP huge jump in capability over 1, in performance, design time, routability, memory, diversity of logic...
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    extra 10 volts why

    These might be helpful : https://www.falstad.com/circuit/e-fullrect.html https://www.instructables.com/Using-Falstads-Circuit-Simulator/ Regards, Dana.
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    Hit Sensor

    Just some guidance : 1) Local to you must be some consultants that would tackle this. 2) ESP8266 would be a suitable low cost easy to design for a wireless solution. One at target, one at shooters position. Also use of this part would be easy to enhance at a later time with more measurements as...
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    Battery over discharge protection & charging module for 12 volt SLA battery

    Yes this is doable. You might look into charging systems for e-bikes. They surely solved this as a problem. https://duckduckgo.com/?q=lead+acid+ebike+chargers&atb=v318-1&ia=web The boards for charging not really an issue, lots of offerings. Its the power generation and possible transient...
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    Hit Sensor

    One would think of using an accelerometer for that application, and a small processor to measure the hit magnitude, impact energy, and width in time to eliminate false hits. Like air current, or removing the target..... When you get a hit what do you want to do with that in terms of signal...
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    charging caps in series

    Varying quite a lot because most large caps like that have wide range of C tolerance hence wide range of V. Q = C x V or V = Q / C Normally when one series caps like that they do a form of ballsting : https://va1der.ca/index.php/balance-resistors-for-series-capacitors/ Regards, Dana.
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    Need help troubleshooting control board

    Coloseup focused pic of bottom of board. Any signs of heat near a component ? Or leakage ? Any caps bulging ? Regards, Dana.
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