Bo Morgan<p>Just ordered some parts to prototype a piezoelectric an experimental tactile interface for "feeling" visual textures.</p><p>I ordered a piezoelectric actuator, some through hole op-amps to drive it, a breadboard, some prototyping wire, some 1/8" prototyping jacks, an assortment of through hole resistors, and a big box of small plastic drawers to organize my parts.</p><p>I'm gonna drive the piezoelectric actuator by driving the op-amp with the audio out from my sound card on my PC. I'm planning to prototype a tiny MCU and tiny camera separately.</p><p>I'm so excited for this project.</p><p><a href="https://kolektiva.social/tags/freehardware" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>freehardware</span></a> <a href="https://kolektiva.social/tags/fosh" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>fosh</span></a> <a href="https://kolektiva.social/tags/ee" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ee</span></a> <a href="https://kolektiva.social/tags/prototyping" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>prototyping</span></a> <a href="https://kolektiva.social/tags/sensors" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>sensors</span></a> <a href="https://kolektiva.social/tags/actuators" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>actuators</span></a> <a href="https://kolektiva.social/tags/mcu" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>mcu</span></a> <a href="https://kolektiva.social/tags/opamp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>opamp</span></a></p>
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#OpAmp
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Dave<p>Nice looking Oshpark boards. I still miss the stickers 😕 <a href="https://mastodon.social/tags/oshpark" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>oshpark</span></a> <a href="https://mastodon.social/tags/opamp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>opamp</span></a> <a href="https://mastodon.social/tags/electronic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>electronic</span></a> <a href="https://mastodon.social/tags/filter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>filter</span></a> <a href="https://mastodon.social/tags/Schematic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Schematic</span></a> <a href="https://mastodon.social/tags/PCB" class="mention hashtag" rel="nofollow noopener noreferrer" 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 noreferrer" 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 noreferrer" target="_blank">#<span>opamp</span></a> <a href="https://mastodon.social/tags/electronic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>electronic</span></a> <a href="https://mastodon.social/tags/filter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>filter</span></a> <a href="https://mastodon.social/tags/Schematic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Schematic</span></a> <a href="https://mastodon.social/tags/PCB" class="mention hashtag" rel="nofollow noopener noreferrer" 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 noreferrer" target="_blank">#<span>electronic</span></a> <a href="https://mastodon.social/tags/opamp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>opamp</span></a> <a href="https://mastodon.social/tags/filter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>filter</span></a> <a href="https://mastodon.social/tags/Schematic" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Schematic</span></a> <a href="https://mastodon.social/tags/PCB" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>PCB</span></a></p>
Bornach<p><a href="https://fosstodon.org/tags/Fake" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>Fake</span></a> operational transconductance amplifiers I bought on <a href="https://fosstodon.org/tags/EBay" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>EBay</span></a> over 6 years ago. Date code doesn't make sense given that Intersil discontinued the <a href="https://fosstodon.org/tags/CA3080" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>CA3080</span></a> over a decade ago. The real chip should have a diode across pins 4 and 5. Only one chip seems to have it -- but it is reversed. The rest have resistors between pins 1 and 4, and between 4 and 5, consistent with an op amp that provides offset null pins. Pin 8 also seems to be connected. Both 1 and 8 should be NC.<br><a href="https://fosstodon.org/tags/electronics" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>electronics</span></a> <a href="https://fosstodon.org/tags/opamp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>opamp</span></a></p>
Laberpferd<p>Habe ein großartiges PDF im Netz gefunden, <a href="https://sueden.social/tags/DonLancaster" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>DonLancaster</span></a> <a href="https://sueden.social/tags/ActiveFilter" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ActiveFilter</span></a> <a href="https://sueden.social/tags/FilterCookbook" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>FilterCookbook</span></a> <a href="https://sueden.social/tags/SallenKey" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>SallenKey</span></a> <a href="https://sueden.social/tags/ElectronicEngineering" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>ElectronicEngineering</span></a> <a href="https://sueden.social/tags/HamRadio" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>HamRadio</span></a> <a href="https://sueden.social/tags/opamp" class="mention hashtag" rel="nofollow noopener noreferrer" target="_blank">#<span>opamp</span></a></p><p><a href="https://www.tinaja.com/ebooks/afcb.pdf" rel="nofollow noopener noreferrer" target="_blank"><span class="invisible">https://www.</span><span class="">tinaja.com/ebooks/afcb.pdf</span><span class="invisible"></span></a></p>
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