Giveaway: Circuit patterns trading cards


Nick Johnson over at Arachnid Labs wants to giveaway a few decks of circuit patterns trading cards.   Each card has a schematic and short description of a common circuit pattern in electronics. Topics covered include digital, analog, and power electronics.

He’ll give these away to 3 random commenters, just leave a comment on this post with a circuit pattern you’d like to see explained on a card and win a deck!

For more information visit the project’s site -Arachnid Labs. It’s also up on Tindie.

Here’s a few example cards. The ubiquitous resistor divider, of course:


capacitative voltage doubler, from power electronics:


If digital’s more your style, there’s the SR latch:


Join the Conversation


  1. I would like to see oscillators explained. I know basically how they work but don’t always remember the math behind them.

  2. I really want this deck, I can’t decide what circuit pattern I would like on a card but I’ll definitely create some rules to play with them!

  3. Ooh – great idea! A simple high and low pass filter would be good. I’m always getting those the wrong way round for some reason! :o/

  4. Great deck! Love to have it.
    Would be nice to see some 555 timer circuits.
    And maybe different configurations of opamps.

  5. Hi,
    Very nice
    Logic gates have always been my pet peeve …
    Oh i would love to have it that’s would be Christmas before Christmas …
    Thank you very much for the challenge

  6. Love the design of these cards and the idea. I keep a “little black book” with circuits like these. Quick to visualize and infinitely useful, its a great reference. I’d like to see a voltage reference based around a reference diode and a pot. Its a cheap, easy to build circuit, that has lots of uses in analog electronics.

  7. Filters, basic 555 and opamps configurations, and maybe some theory behind transformers or a rectifier.

  8. A full wave rectifier is such a basic circuit that I think it should be listed here.
    Another nice one would be an R/2R D/A converter

  9. These are pretty awesome. Being new to the electrical world, they’ll help me out a lot. I’m going to pick up a set whether I win or not. If I do win, I’ll take the set to school and leave them in the lab.

  10. PWM > DC Using OpAmps or a RC Filter, R/2R ladder, Simple Transistor circuits with the matching formulas.
    Nice idea!

  11. Hey, you could design a Forrest Mims card game! So love these reminds me of many hours as kid spent over a breadboard with a homemade logic probe.

  12. Brilliant idea – all we need to do now is turn it into a Top Trumps game!

    If not already included, I’d ensure that all the “standard” op-amp circuits are included and basic RC and LC filters.

  13. What a great idea. What a easy way to learn some new stuff. I love it. I am at beginner level. Where can I buy this?

  14. I’d love a set. Maybe using someone like drive-thru-cards and their print on demand to cut the cost down. $20 for a set of cards (after shipping) just cuts a bit high for me.

  15. I’d love to see some RF/signal cards:
    – Basic transmission circuits: AM/FM; antena length; power;
    – Signal reflection / terminal resistor;
    – Digital transmission: ASK/FSK/PSK – analog circuitry to feed decoder specific IC;
    (I think you can have a whole dec color only for this).

  16. parallel shift register applications. PWM. This are awesome if I don’t get them I would buy them anyway.

  17. A category for RF circuits
    1) different receiver architectures
    2) transmitters
    3) filters
    4) oscillators
    5) synthesizers

    Another category for measurement circuits
    1) voltage measurements
    2) current measurement
    3) LCR meter design
    4) frequency measurement

  18. Despite the danger of sounding like a newbie, I’m still confused by op-amps. So any cards with these beasties are great.

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