Thermal Indicator Circuit for Heatsinks

The post details how to build a simple 3 LED thermal indicator circuit for heatsinks and other similar applications to quickly understand the level of heat on the selected surface through a sequential 3 LED panel. The temperature of a heatsink can be measured with a wet finger: if it sizzles, the temperature is too […]

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Doorbell With Memory Circuit

The post explains how to enahnce your doorbell with a circuit which would facilitate a doorbell with memory circuit and allow the user to know through an illuminated LEDĀ if somebody has pressed the doorbell button while he was out and unavailable at home. On situation it could be helpful to understand when a guest has […]

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Simple Temperature Indicator using BC547 Transistor

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 […]

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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 […]

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