ICONOS MD 807

[Funfinder]

Good idea, Morgan so this topic remains to the Iconos MD 807.
Here's the thread:

Simple but brilliant LRL
http://www.geotech1.com/forums/showthread.php?p=112103

[detectoman]

hello morgan and guys, the bfo sta clara ( saxon ) is the best for be stable, only put the first oscilador transistor reversed, bc548, whit these these bfo came stable, these bfo acept evervary transistor in the other steps for operation, if you put to final stage an mps, a12 have amount of sound, but whit other resistence
you should put near of 325 turns of wire in reference coil may be .20 wounded in pipe of plasti of 1 cm, and extended these turns aprox, 8 cms, then put inside an ferrite nucle for adjustable
the best configuration of turn, is where the speaker sound how tac tac
in coil of down plate, near of 3 ohms of wire
but for projet lrl, and ciruit static jfet, you should aproximate the wire same of all's coil, for an armony, equal thickness e.g
so if wire of plate bfo detection is .20, i think you should put in all, too .20, and anten static too .20
should acomplish in lrl bfo-static, and wave resonance in all coils, may be the coil detection ( not reference )
so, if static reception is out of resonance whit coils bfo, or in other dimension, the bfo not detect far, too very important is the tipe of transistor
a13 last step, is good but very hig consume energy, so bc 548 is adecuate
inn saxon, you can play whit variety of transistor, any detect rf major
i build an bfo saxon very stabile, put first osc, reversed transistor 548, any 2 little cap cross in determined part, i have the schematic in any notebook need find, but saxon is very noble bfo, i sure no need reversed transistor of stabilizations, if coils wire gauge of bfo, is in equalibration, no need to all,
the bfo saxon is the most apropiate for soil mineral exclusion, but not discriminate
if you go use bfo, i can give opinions at everyvary
bfo saxon project, isnt deeper but not detect little trash, is fine
for me the make these old project and modify, is my beauty hobby
bfo is the champion

[detectoman]

apologies, no! wire of coil of plate in bfo saxon, should be no thin, for normal md
but first make the reference coil whit 325 turns, wire most thin, plastic 1 cm- 8 extended, adj nucle, how in anterior mesage, after calculate winding the rastre coil @ obtain right silence in speaker and stable
but for conjunction how lrl, & added circuit, rf or static, need other configuration in other armonics, to silence, or, hum", this no easy
the difficultous all,'s lrl is the put to point final adjust calibration, this is always narrow

[Morgan]

Originally Posted by detectoman

apologies, no! wire of coil of plate in bfo saxon, should be no thin, for normal md
but first make the reference coil whit 325 turns, wire most thin, plastic 1 cm- 8 extended, adj nucle, how in anterior mesage, after calculate winding the rastre coil @ obtain right silence in speaker and stable
but for conjunction how lrl, & added circuit, rf or static, need other configuration in other armonics, to silence, or, hum", this no easy
the difficultous all,'s lrl is the put to point final adjust calibration, this is always narrow

No need this 325 turns,i build my saxon BFO and use variable capacitor from old pocket radio,and it works fine.

[detectoman]

???????????????? howwwwwwwwwwww? then var cap make the time's coil oscilator? may be may be, I am disapointed, due condenser is an aluminum coil
wow morgan you is an genius of electronic, i go implement these crazy idea
i go need an big seleector for caps

[Morgan]

Originally Posted by detectoman

???????????????? howwwwwwwwwwww? then var cap make the time's coil oscilator? may be may be, I am disapointed, due condenser is an aluminum coil
wow morgan you is an genius of electronic, i go implement these crazy idea
i go need an big seleector for caps

In stead of the reference coil with 325 turns,you can use 1 mH chok variable from an old radio.

[detectoman]

bfo for most range, i prefer coil big large 8 cm 1 cm diameter center adj of brass whit nucle or iron spring ( anten ) 325 turns more less
saxon for president