C.<p>This will be slightly <a href="https://mindly.social/tags/geeky" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>geeky</span></a>, and probably only of interest to <a href="https://mindly.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a> hobbyists and <a href="https://mindly.social/tags/guitar" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>guitar</span></a> players. I happen to sit in the intersection of that particular <a href="https://mindly.social/tags/Venn" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Venn</span></a> diagram.</p><p>When I was a teenager, having only been playing guitar for a few years, I owned a guitar <a href="https://mindly.social/tags/effects" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>effects</span></a> pedal that went on to become legendary - the Boss HM-2 "Heavy Metal" <a href="https://mindly.social/tags/pedal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pedal</span></a>. Its sound is still ubiquitous in metal.</p><p>I don't have it any more. I think I traded it for an analog chorus, which was a seriously expensive pedal back then. Although I have other <a href="https://mindly.social/tags/distortion" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>distortion</span></a> effects, I've missed it a lot over the years.</p><p>Well, lots of hobbyists build their own effects. And the circuit schematics for many effects, particularly the classics, are available online. So like many others, I decided to build my own HM-2.</p><p>This image is the schematic for the <a href="https://mindly.social/tags/HM2" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HM2</span></a>. It's not the most complicated pedal, but it's a league above something like an Ibanez Tube Screamer. As far as active devices go, it's got 6 <a href="https://mindly.social/tags/opamps" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>opamps</span></a> and 10 <a href="https://mindly.social/tags/transistors" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>transistors</span></a> of various types, along with a bunch of diodes for multiple types and stages of clipping, and the usual jumble of capacitors and resistors. Oh, and four potentiometers.</p><p>1/x</p><p><a href="https://mindly.social/tags/EffectPedal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>EffectPedal</span></a> <a href="https://mindly.social/tags/HeavyMetal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>HeavyMetal</span></a> <a href="https://mindly.social/tags/pedals" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pedals</span></a> <a href="https://mindly.social/tags/metal" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>metal</span></a> <a href="https://mindly.social/tags/DIY" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>DIY</span></a> <a href="https://mindly.social/tags/schematic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>schematic</span></a> <a href="https://mindly.social/tags/circuit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>circuit</span></a> <a href="https://mindly.social/tags/hobby" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hobby</span></a> <a href="https://mindly.social/tags/OperationalAmplifier" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>OperationalAmplifier</span></a> <a href="https://mindly.social/tags/TubeScreamer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TubeScreamer</span></a></p>
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#schematic
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Shonky Electronics!<p>Previous <a href="https://mastodon.social/tags/breadboard" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>breadboard</span></a> abominations interfacing a FT245 to a <a href="https://mastodon.social/tags/rc2014" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>rc2014</span></a> have been done largely from memory and having several webpages open. </p><p>I figured it was time to actually capture a <a href="https://mastodon.social/tags/schematic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>schematic</span></a> and I also updated the logic to include bit 7 of the 6850 control register (interrupt enable) and an open collector interrupt request.</p><p>Rebuilt it with the new logic using the schematic and it all still works, along with better interrupt capability.</p><p>Still a mess though!</p>
Spencer Wolfe<p>Sometimes, you just gotta break out the <a href="https://mastodon.social/tags/algebra" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>algebra</span></a> and a touch of <a href="https://mastodon.social/tags/calculus" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>calculus</span></a> for a particular <a href="https://mastodon.social/tags/led" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>led</span></a> <a href="https://mastodon.social/tags/circuit" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>circuit</span></a> </p><p>At least, when you want to make sure you don't let out the magic smoke.</p><p><a href="https://mastodon.social/tags/electronics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronics</span></a> <a href="https://mastodon.social/tags/circuits" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>circuits</span></a> <a href="https://mastodon.social/tags/lighting" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>lighting</span></a> <a href="https://mastodon.social/tags/schematic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>schematic</span></a> <a href="https://mastodon.social/tags/math" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>math</span></a></p>
Bo Morgan<p>I just finished my first attempt at a design for a schematic symbol in Kicad for an MCU (STM32N657Z0H3QTR).</p><p><a href="https://estore.st.com/en/stm32n657z0h3qtr-cpn.html" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">estore.st.com/en/stm32n657z0h3</span><span class="invisible">qtr-cpn.html</span></a></p><p><a href="https://kolektiva.social/tags/pcb" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>pcb</span></a> <a href="https://kolektiva.social/tags/mcu" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>mcu</span></a> <a href="https://kolektiva.social/tags/kicad" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>kicad</span></a> <a href="https://kolektiva.social/tags/schematic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>schematic</span></a> <a href="https://kolektiva.social/tags/stm32" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>stm32</span></a></p>
Dave<p>Nice looking Oshpark boards. I still miss the stickers 😕 <a href="https://mastodon.social/tags/oshpark" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>oshpark</span></a> <a href="https://mastodon.social/tags/opamp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>opamp</span></a> <a href="https://mastodon.social/tags/electronic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronic</span></a> <a href="https://mastodon.social/tags/filter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>filter</span></a> <a href="https://mastodon.social/tags/Schematic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Schematic</span></a> <a href="https://mastodon.social/tags/PCB" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCB</span></a></p>
Dave<p>I put the Kicad Schematic & Layout in Github <br><a href="https://github.com/daveb377/Active-Filter" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://</span><span class="ellipsis">github.com/daveb377/Active-Fil</span><span class="invisible">ter</span></a></p><p><a href="https://mastodon.social/tags/opamp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>opamp</span></a> <a href="https://mastodon.social/tags/electronic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronic</span></a> <a href="https://mastodon.social/tags/filter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>filter</span></a> <a href="https://mastodon.social/tags/Schematic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Schematic</span></a> <a href="https://mastodon.social/tags/PCB" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCB</span></a></p>
Dave<p>Since I've never needed to build any low frequency active filters, I'm going to spin a proto board to see how they work. Set up for a dual op-amp footprint, and a Sallen Key on one side, and a multiple feedback on the other.<br><a href="https://mastodon.social/tags/electronic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>electronic</span></a> <a href="https://mastodon.social/tags/opamp" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>opamp</span></a> <a href="https://mastodon.social/tags/filter" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>filter</span></a> <a href="https://mastodon.social/tags/Schematic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Schematic</span></a> <a href="https://mastodon.social/tags/PCB" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCB</span></a></p>
Ross of Ottawa<p>Ugh, an intensive day with too much sitting, fully immersed in circuit work. </p><p>The ramp up with <a href="https://mastodon.social/tags/KiCad" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>KiCad</span></a> tools was very smooth. I didn't find any roadblocks in <a href="https://mastodon.social/tags/schematic" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>schematic</span></a> capture, part coding, <a href="https://mastodon.social/tags/PCB" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>PCB</span></a> layout, nor cleaning up DRCs. The tools have come a long way since my last use in 2021! Pleased!</p><p>A scan through manufacturability tomorrow and the full cycle is complete. Yay <a href="https://mastodon.social/tags/FOSS" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>FOSS</span></a>.</p><p><a href="https://mastodon.social/tags/hardware" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>hardware</span></a> <a href="https://mastodon.social/tags/design" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>design</span></a> <a href="https://mastodon.social/tags/maker" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>maker</span></a></p>
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