Hello all,
Using info from the web and this forum, did some mods to the HF Centec 97245 handheld metal detector.
Page provides mod info with pictures and also experiments of the effect of temperature on the unit
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Click here for page for mods done
· Add radioshack vibrate motor
· Add switch selector for original piezo buzzer or vibrator
· LED straightened and brought out top of case
o LED now lights when metal detected and not a ‘flashlight’ anymore.
o Sink the LED with a 1k resistor versus the oem 300 ohms
o Current draw with no detect is < 5ma now (no LED lit)
o With piezo selected (and LED lit), current draw is ~45ma
o With vibrator motor (and LED lit) current draw is about 38ma
· Add external adjustment for the internal balance potentiometer - provides range of not quite 2 inches
· Add larger knobs for the sensitivity adjustment and external adjustment
Gene
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http://www.thunting.com/smf/index.php/topic,38834.msg239512.html#msg239512
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