DIYbanter - mystery pic

DIYbanter (https://www.diybanter.com/)

- Electronic Schematics (https://www.diybanter.com/electronic-schematics/)

- - mystery pic (https://www.diybanter.com/electronic-schematics/209672-mystery-pic.html)

A Screen door that will not tear out when the little kids run at it and push
the door open by the screen.

Photo micrograph of compound computer bug eyes.

Hmmm, good one, phil.

"Phil Allison" wrote in message
...

....... Phil

Phil Allison wrote:

....... Phil

Home made electrostatic loudspeaker?

"Oppie"

A Screen door that will not tear out when the little kids run at it and
push
the door open by the screen.

Photo micrograph of compound computer bug eyes.

Hmmm, good one, phil.

** It is a close up taken of a Quad ESL63 panel ( see new pic ) on my
ench - but from the reverse side and showing the fine nylon gauze used as
acoustic damping.

The punched holes in the PCB material are all of 1.7mm dia.

........ Phil

"Phil Allison" wrote in message
...

"Oppie"

A Screen door that will not tear out when the little kids run at it and
push
the door open by the screen.

Photo micrograph of compound computer bug eyes.

Hmmm, good one, phil.

** It is a close up taken of a Quad ESL63 panel ( see new pic ) on my
nch - but from the reverse side and showing the fine nylon gauze used as
acoustic damping.

The punched holes in the PCB material are all of 1.7mm dia.

....... Phil

Interesting, I haven't worked with electrostatic speakers and looked up
ESL63.

Ever try a flame speaker? I messed with them in the 60's using an acetylene
torch with a flame seeded by sodium chloride and electrodes placed in the
flame. Audio was fed to the electodes with a DC bias. Interesting laboratory
curiosity and vastly impractical.
http://www.swtpc.com/mholley/Popular...lification.htm

Oppie