As Lasse notes, life must have been cheap in those days.
John Larkin Highland Technology, Inc
picosecond timing precision measurement
jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com
Using a Pot to Tune a Coil
Jun 13, 2015
65 Replies
Den mandag den 22. juni 2015 kl. 19.39.06 UTC+2 skrev John Larkin:
g sis
I'm sure there still is, stuff with stuff like this:
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you need mechanics
stuff like screw machines,
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are probably almost all replaced with cnc
-Lasse
-Lasse
Here's one I've had around for a while:
https://www.dropbox.com/s/dhwrbf1eh8eunfd/Dscn1697.png?dl=0
John Fields
--- HMM...
You must have missed my post:
If you're working with cores that can be saturated, you can put an extra winding on the core and run enough DC through it to get the core close to saturation. That'll decrease the inductance and, if you start with a frequency somewhat lower than what you want, the change in inductance will allow you to tune it to the frequency you want.
Look up "saturable reactor"...
I actually tried it using a junkbox transformer with a 120V 60Hz primary and a 24V 300 mA secondary, like this,
. SIG . GEN . +-----+ . | ~|--[10k]----+--------+------+ . | | | | | DC . | | | | [300nF] SUPPLY . | | | | | +------+ . | | [SCOPE] [COUNTER] + +--|+ Iadj|---+----+ . | | | | P||S | | | | . | | | | R||E | | [POT]
By chance, is their patron saint Rube Goldberg?
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