Turn counter for winding a transformer using a computer LPT port. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Turn counter for winding a transformer using a computer LPT port. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Measuring technology

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Rimas sent this one circuit of the counter of turns when winding the transformer. He's writing :

"The program starts working only after the circuit is correctly assembled and connected to one of the 4 possible printer ports. The program itself recognizes which port it will work with. If the circuit is correctly assembled after starting the program skait.exe the message "Ready" will appear on the screen, confirming the readiness for operation and the LED on the device board will light up.

Turn counter for winding a transformer using a computer LPT port

In this case, the counter will show W = 0. When contacts X1, X2 are closed, pulses will be counted on the screen: W = 1, W = 2, etc., respectively, how many turns will be wound on the transformer frame. Pressing the "-" key will count backwards W=10,W=9 .

This is necessary for winding the wire. The "+" key will start counting forward pulses again. Exit the program - the Esc key. The device itself is assembled on a double-sided board and I placed it right on the connector itself and fit into a standard housing from the connector. As you can see in the diagram - you do not need a hotel power source. The voltage is taken from the data bus to all outputs by applying a logic 1. When the program starts, the LED on the probe lights up, this corresponds to the +5V voltage applied to the device board. When the program exits, the LED goes out - the voltage is removed from the microcircuit. The device can be connected and disconnected without turning off the computer.

Author: Rimas; Publication: cxem.net

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