Print

Pool09-dev

IDEE

Badeinsel mit DIY Hydrophone und Speakern

from:http://www.epanorama.net/circuits/microphone_powering.html#phantom

Better electret microphone phantom powering circuit

This circuit provides lower impedance output than the circuit above:
      +-----o---------------------330R--------+
      |     |                                 |
      |    2k2                 +---10k----+   |
      |     |                  |          |   |
      |     |                  |       E--o---|--------------- COLD
      |     o---------||----o--o-------B      |
      |     |         1u0   |          C      |
      |     |+              +-100k-+   |      |
      |  CAPSULE                   |---o------o
      |     |-              +-100k-+   |      |
      |     |               |          C      |
      |+    o---------||----o--o-------B      |
     10u    |         1u0      |       E--o---|--------------- HOT
      |-    |                  |          |   |
      |     |                  +---10k----+   |
      |     |                                 o----+
      |    2k2                               +|    |+
      |     |                                12V  10u
      |     |                                -|    |-
    --o-----o---------------------------------o----o---------- GROUND


Component EBC is a PNP bipolar transistor (for example BC479). Ideally these should be hand-picked for low noise and matched gain. Bear in mind that VCE can be up to about 36V. The 1u0 capacitors should be high quality plastic film types. The circuit may benefit from the addition of 22pF capacitors in parallel with the two 100k resistors. For minimum hum pickup the two 2k2 capsule bias resistors should be accurately matched.

Source: PZM Modifications web page by Christopher Hicks.

Created by kiilo. Last Modification: Wednesday 24 of June, 2009 19:57:24 CEST by kiilo.

History

KiikiTikiWiki

skype

My status

Site Language: English

Shoutbox

kiilo, 19:11 CET, Wed 06 of Jan, 2010: hi cornell was in taiwan and in the forest afterwards without net - im fine ib basel now || HAPPY new YEAR und many HUGS from everyone you like too ;-)
prizy, 18:17 CET, Sat 02 of Jan, 2010: HAPPY NEW YEAR TO EVERYONE WHO MAY READ THIS MESSAGE
prizy, 01:01 CET, Fri 30 of Oct, 2009: hallo Tobias, wird schon mal wieder zeit dass dier uns sehen, bevor der schnee wieder fällt.. gutes gelingen lg c.
prizy, 19:28 CEST, Tue 25 of Aug, 2009: Super, Super,Super dadi, trall-la.la
prizy, 10:42 CEST, Fri 21 of Aug, 2009: wünche dir ein guten voller inspirationen erfüllten tag