Select Language
The following is a circuit diagram of [30 seconds Countdown Timer circuit]
In this design, a ternary subtraction counter and two decimal subtraction counters are needed to achieve timing for 30s, and a 30-second countdown counting circuit to 0.1s is displayed. We can implement these three counters with three 74LS192s. The up counter pulse input terminal of the three counters in the counting module must be connected to a high level, and the borrowing signal of the low bit slice is added to the down counting pulse input end of the upper slice. The borrow signal of the high slice counter controls the alarm signal, and the borrow signal is always high when counting down.
April 04, 2023
February 15, 2023
December 16, 2024
In general, Europe is the preferred tourist country for everyone. So when we go abroad, we need to prepare something. Everyone knows that the commonly-made plug converters cannot be used normally in...
In household electricity, high-power electrical appliances are often used, but if a low-power outlet is used, accidents such as short-circuiting are likely to occur. Common sockets are generally 16a...
Nowadays, more and more smart home appliances enter people's field of vision. Many smart home appliances need intelligent remote control switches. How about the price of smart remote control...
After investigating the market, we found that all kinds of smart appliances, even sockets used by consumers for many years, are also smart. At present, there are more than ten kinds of smart sockets...
Email to this supplier
April 04, 2023
February 15, 2023
December 16, 2024
Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.
Fill in more information so that we can get in touch with you faster
Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.
