A DIY Tunable Pickup: Any sound, one pickup

A guitar pickup is a device used to capture the sound of vibrating guitar strings and convert it into an electrical signal that can be amplified and heard through a guitar amplifier or recording equipment. Pickups are an essential component of electric and electric-acoustic guitars, as they play a crucial role in shaping the instrument’s … Read more

DML Speakers so good — panels of acoustic ceiling tile and extruded polystyrene

Listen to the positive responses of listeners.  Almost as good as headphones as the ultimate standard; however, this was not A/B tested.  Also it would be nice to see EQ / response curves. https://www.youtube.com/watch?v=GslJ8Hf4WwE Distributed Mode Loudspeakers           ===   Distributed mode loudspeakers (DMLs) are a type of speaker technology that … Read more

Measuring DIY Speakers — ported / sealed — insulated / not — plastic fiber concrete boxes — Room acoustics, treatments

https://www.youtube.com/watch?v=jjZHFIdfUFk   Helium gas inside enclosure.  Overall +2dB gain as speaker back-pressure is reduced.     Anechoic chamber response — blue/purple is speaker-forward facing; red is speaker-rear facing (into absorptive lining).     Ported vs Sealed.  Ported gives overall more bass output (+5dB), all other factors approximately equal.  Green is ported; blue/purple is sealed.   … Read more

TESLA Roadster, released “open source” per Elon Musk

Information available so far is not full production ready — you can not replicate from parts the TESLA ROADSTER; however, there is information down to legitimate circuit-level detail. Super-interesting regarding the ‘theory’ and also ‘circuits’ which includes altium schematics. — from the comments — “What they released is everything a dealer technician would need to … Read more