kyak changed the topic of #qi-hardware to: Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben/atusb 802.15.4 wireless, anelok and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs and http://irclog.whitequark.org/qi-hardware
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<kristianpaul> o/
<xentrac> hello.kt:3:7: error: expecting an element
<xentrac> hello.kt:3:5: error: unresolved reference: o
<xentrac> ^
<xentrac> o/
<xentrac> o/
<xentrac> I mean hi!
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<wpwrak> xentrac: i see that DocScrutinizer51 is around. he's the one you're looking for with your audio circuit.
<xentrac> hi DocScrutinizer51!
<xentrac> I was asking about https://is.gd/reactivedac in this case
<xentrac> the left-hand part of the circuit is generating PWM, the lower right uses two capacitors and a transformer to reactively filter the PWM signal
<xentrac> well, a center-tapped inductor, really
<xentrac> I got this idea of using an inverter to reduce the PWM ripple on the output from this EDN article by Stephen Woodward: https://www.edn.com/design/analog/4329365/Combine-two-8-bit-outputs-to-make-one-16-bit-DAC
<xentrac> but I wanted to do the filtering purely reactively (or as close to purely reactively as possible) in order to maximize the power efficiency
<xentrac> eyeballing the plots, it does seem like it achieves better filtering than *just* the RLC low-pass filter corresponding to the relevant part of the transformer and the output cap
<xentrac> but I feel like I don't know enough about filter design to know if a π LC filter or something would work better with the same number of reactive components and no inverter
<xentrac> what do you think?
<xentrac> (apologies for using Falstad's simulator here; I don't know how to use SPICE or WR-SPICE yet)
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