Timer to turn off the game console. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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Everyone knows that the time spent by children on various game consoles often exceeds any reasonable norms. And often no amount of arguments from adults can help convince the guys to take a break and do something else. This is where a simple "electronic assistant" - a timer - will help.
The device is designed to turn off the game console after a certain time. Approximately one minute before the set break, a warning tone sounds. During this time, you should stop the game and turn off the console with a regular switch. Otherwise, a forced power off will occur. After switching off, the device must be in the off state for 1.5 ... 2 hours so that the time-setting capacitor is completely discharged. If you try to turn on the set-top box ahead of time, a warning signal will sound, power will not be supplied.
The scheme of the device is shown in fig. one.
On the elements DD2.1 and DD2.2, a rectangular pulse generator with a repetition period of about 1 s is assembled. From the output of the generator, the pulses are fed to the input of the counter DD1. After the arrival of the 8192nd pulse (after about 2 hours), a log appears at the output 213 of the DD1 chip. 1 and through the opened transistor VT1 the capacitor C3 begins to charge. Transistor VT2 opens. At the inputs 5 and 6 of the DD2.4 element, a log is set. 0, its output is 4, respectively, log. 1, which is fed to the inputs 8 element DD2.3 and 6 element DD3.4. A high level at input 8 of the DD2.3 element allows the supply of trigger pulses to the input of the audio signal generator, made on the elements of DD3.2 and DD3.3.
A single signal at input 6 of the DD3.4 element puts this element into standby mode, and when a high level appears at its input 5 from output 26 of DD1 (after about 1 min), the low level from the output closes transistors VT4 and VT5. thereby cutting off the power supply of the set-top box.
When the supply voltage is turned on, a short pulse from the output of the differentiating circuit C6R7 is fed to input 5 of the element DD3.4. If the capacitor C3 is not discharged at the same time (less than 1.5 ... 2 hours have passed since the end of the previous game). at the input 6 DD3.4 - log. 1. A log appears at the output of DD3.4. 0. Transistor VT3 turns on and fixes this state. As a result, a warning signal will sound, and the power supply to the game part will not be supplied.
A drawing of the printed circuit board of the timer is shown in fig. 2.
A properly assembled device starts working immediately and does not need to be adjusted. The operating time of the set-top box is determined by the capacitance of the capacitor C2 and the resistance of the resistor R2.
The break time is determined by the elements C3, R5 and the parameters of the transistor VT2. The printed circuit board is designed to be installed in "Subor" SB225-B. therefore, when using the timer in the "Dendy" or "Sega" consoles, you may need to resize it.
The timer is connected to the break of the positive power cable of the console: point A - to the power supply, C - to the game console. Point B is connected to the negative power conductor.
To reduce supply voltage losses, we recommend replacing the VT5 transistor with a pn-p transistor (for example, KT816 or KT837 with any letter index). Its emitter should be connected to conductor A. the collector - to C, the base - to the top terminal R11 according to the circuit, disconnecting it from circuit A. The emitter of the transistor VT4 must be connected to the common wire, and the value of the resistor R9 should be increased to 43 kOhm. Transistor VT4 must be selected with a base current transfer coefficient of at least 100.
Author: M. Fedotov, Severen, Tomsk region
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