The simplest probe from the old talking clock TALKING. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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The simplest probe from the old talking clock TALKING. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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I don’t know, maybe someone has already thought of this - to shove a probe into an electronic watch, but in this case I myself did it before. I have the simplest "ark": two batteries, a P2K non-latching switch (this is to change the polarity of the voltage on the probes with one click) and an LED with a resistor, but this economy takes up a lot of space in the box where I put it. So I decided to make it even simpler, but much smaller.

The simplest probe from the old talking clock TALKING. Probe - watch

I think aloud: "In order to find such a box, where the battery from the clock and the liquid crystal indicator from the same clock will fit, plus a couple of wires to solder - that will be the simplest probe-baby.", And the wife, passing by, hears this, climbs into the closet and gets... old clock "Chinese" talking - "TALKING" in a huge black case! An indicator, a battery and, in addition, a piezoelectric buzzer - all in one bottle that you can wear on your hand :)

The result is the thing shown in the picture. If to the tracks that are closed by the watch button (any, but I took the far right one, because this is the mode switch button and it makes only short sounds, and also because I’m used to wearing the watch on my left hand), solder the wires with probes, and block the button itself (I melted the plastic directly on the button with a soldering iron) - then it turns out a probe with a plus voltage on one and a minus on the other probe (which is not difficult to measure yourself) and a threshold resistance of about 30 kOhm:

if the resistance of the circuit under test is greater than the threshold, the buzzer is silent;
if it is within 30 + - 3 kOhm (it happened to me) - then the squeaker squeaks continuously with short sounds
if the resistance is less than the threshold, only one sound is heard when touched, and then the squeaker stops.

Transitions of diodes and transistors are perfectly checked.

In general, if anyone is not too lazy, then you can stuff an entire radio laboratory into this huge case from TALKING watches.

Publication: cxem.net

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