The post explains a simple temperature indicator circuit using a single BC547 transistor and complementary 1N4148 diode. The temperature indication of a heat sink on a power transistor in high power circuits can be extremely useful. A simple, inexpensive temperature indicator would be ideal for this purpose since accuracy is not an important factor. In […]
Indicators
Simple Lamp Flasher Circuit
In this post we learn how to make a simple miniature lamp flasher circuit using some inexpensive transistors, resistors and capacitors. Let’s learn the details below: A lamp flasher is a device which is designed and used for switching a connected lamp alternately ON/OFF at a certain given rate per second. Meaning, a lamp or […]
Car Chasing LED Arrow Turn Signal Indicator Circuit
A very simple yet interesting Chasing LED arrow car tun signal indicator circuit is discussed in this article. The circuit uses just a single 10 stage Johnson’s decade counter IC 4017 and an UJT for executing a very interesting two pattern LED light chasing on the connected LEDs, which produce an impression of creating an […]
How to Test a SCR
In this post we learn how to test a SCR whether it’s good or bad using a couple of simple circuit implementations Simple SCR testing circuit Referring to the diagram below initializing the shown normally-open “on” push to ON button connects the gate to the anode, enabling current coming from the negative lead of the […]
Automatic Light Circuit for Washroom
Building an automatic light for washroom is not at all complex. All you need to do is to follow the steps as described in this report to get the derived result. Using an automatic switch would help to save electricity. Moreover, the system is designed in a way to run on lesser power, thereby […]
How to Build a Door Bell with Memory Circuit
On occasion this could be helpful to understand when a potential user has visited your door steps as part of your absence. This is especially valid in the circumstance of an unplanned absence when a prospect is anticipated. Bafflement is the greatest upon these situations. The Door Bell with Memory circuit below really helps to […]