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White's tr

A

Anonymous

Guest
Do anyone have any info circuit etc on the White's TR
I can't get this thing to work. the first IC 4024B Ripple-Carry Binary Counter/dividers.The next IC LM358P Dual Op amps.At this time I don't know how to test this thing.HELP HELP <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?"> <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?">
 
it SO primitive seems as not to be quickly pencil up.
please give me a back side of this toy I will do it in a blink! <img src="/metal/html/grin.gif" border=0 width=15 height=15 alt=":grin">
YOURS
 
Thanks I want to learn how this puppy works.
Any info will help <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=":)"> <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=":)"> <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=":)"> <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=":)"> <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=":)">
 
Shame on White's for that poor soldering job! There is leftover flux all over the place.
 
Can you help on how this circuit works? <img src="/metal/html/oh.gif" border=0 width=15 height=15 alt=":O">
 
imho, I see following blocks:
- voltage stabilizer on U2B (voltage must be very stable in the cases), Point 7.it may be from 6 to 12 V in value, but what it is due....
- oscillator-transmitter on Q3 and coil,
- counter U1, it must mix a frequency F from TR and F/32. or, F/32 modulates F. so we hear the reaction it in case there is a metall,
- U2A,Q2,Q3 are sound amplifier.
TR is amplitude sensitive to metal. some threshold level is set by resistors in Point 3 on counter input so there must be NOT the sound. then on a metal the amplitude will increase up and the divider will be activited.
I think Carl will agree to do my explanation much better... <img src="/metal/html/smile.gif" border=0 width=15 height=15 alt=":)">
 
Good job, KT.
CC, U2B is a voltage regulator, the output (test point "7") is equal to the voltage of diode D2 plus the zener. I'd guess 5-6 volts, depending on the zener diode used.
Q1 is the transmit oscillator, and will free-run at some particular frequency, depending on the transmit coil. It probably also connects to the receive coil, in such a way that a receive signal shows up at test point 3, and becomes the clock to the divider. The pot would adjust the threshold level. 1/32 of that frequency, becomes the audio.
There isn't much to go wrong. If the regulator voltage seems reasonable, I'd probably check the coil with an ohmmeter. Beyond that, you'll need an oscope.
--Carl
 
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