The article describes a straightforward yet practical circuit for a 10-step selector switch that may be controlled with a single push-to-ON button. The circuit is utilized as a three-step, single push motor speed controller unit in the schematic layout that follows.
This circuit was requested by one of the avid followers of this blog, as given below:
Scientific Details
Hi, sir. I hope you have a pleasant day. Would you kindly design a circuit to control the speed of my DC motor using only one switch (a push button)? It should be set to low on the first push, medium on the second, and high on the third. My 12-volt relay, which has three relays for low, medium, and high settings, will be connected to the output. My DC motor, which includes a rheostat for speed control, will thereafter receive the relay's output. I'm going to utilize this for the air conditioning system in my car. Thank you, and keep up the fantastic blog work!
Circuit Diagram
Circuit Description
When high/low alternate logic switching occurs at pin #14, the IC 4017, a Johnson decade counter IC with 10 decoded outputs, is intended to provide sequential logic high outputs.
The change in the position high logic cycles are generated across the IC's output pinouts from pin #3 to pin #11 when pin #14 is activated or flipped employing a push-button switch.
shortly as the logic sequence hits pin #7 of the IC, the IC is reset back to the initial pinout because just three outputs are needed in the schematic that is displayed for executing three relay-based switches.
You may set up the transistor relay driver stages throughout all ten of the IC's output pins whenever you wish to create a 10 relay functionality.
The circuit for Applications:
As seen below, the aforementioned idea may be used as a three-step LED brightness controller with just one push button:
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