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#electronics

66 posts50 participants12 posts today
Public
Matt

Anyone have a good design for a circuit or IC that generates a clean sine wave within the range of 20Hz-20kHz?

Bonus points if it doesn't require a specialty chip (anything outside of the 74- or 4000 series)

#electronics#synth
Public
Jer 🚵🏼

Something different to start the morning. One of the 6yr old rechargeable hearing aids showed “battery failure” light (using what for power, eh?) yesterday so I carefully nudged the clever little pins holding it together. Batteries at the back, they appear to be soldered/spot welded to tiny wires. Most of the device seems dedicated to enclosure.
#electronics #hearing #phonak

side view of hearing aid with bottom plastic cover removed. There’s round button batteries, maybe a coil or two, some kind of electronics “sandwich” circuit boards, and small round catches holding the top on. A push pin is shown for scale and the wire with three leads/pins leading to actual ear speaker is on bottom right
The top removed and now there’s another layer of “stuff”, this being clear flexible plastic that interfaces with rocker switch controls and maybe two screened openings where sound is guided to microphones below. There’s a thin green flexible circuit board below, but components are probably on the other side.
Public
N3VEM

#electronics and #HamRadio #DIY peeps: for surge suppression, for a control line, DXE sells this thing, for like a lot of money. based on the picture it looks like its just a capacitor from each wire to ground, I'm assuming theory is that normal use the capacitor blocks the dc control voltages from ground, but with impulse or ac induced by nearby lightning would shunt to ground.

Anyway, the question is....
does anyone know what type/value of capacitors to use, if I were to home brew this?

the inside of a surge suppressor. Its in a metal box, and the side you can't see is basically terminal strips that come through to these capacitors that are on the inside. There is a stud to tie the metal box to ground.
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