Tuesday, August 26, 2014

Aquarium Fish Feeder Timer Controller Circuit

The post explains an aquarium feeder timer circuit which sustains a set of continuous operations as per a predetermined timing sequence through the respective pot controls. The idea was requested by Mr. Mike.

Monday, August 25, 2014

Industrial Tank water fill/drain controller circuit

The post presents an industrial water level controller with drain timer circuit. The idea was requested by Mr. Lanfrank.

Friday, August 22, 2014

Car Power Window Controller Circuit - Part 1

The article explains a car power window controller circuit using a single push button or a couple of push buttons. The idea was requested by Mr. Win.

Car Power Window Controller Circuit - Part2

In the previous post we discussed the circuit design of an automatic car power window controller, here we'll learn how it may be enhanced with more features.

Wednesday, August 20, 2014

1.5 V Inductance Meter Circuit

Here a simplest yet quite accurate inductance meter is presented, which can be built within few minutes. Furthermore, the circuit can be powered-up with a single 1.5V cell. However, a frequency meter would be required to work-out the inductance.

Lithium Polymer Battery Charger Circuit

The post explains a simple lithium polymer battery with over charge cut off feature. The idea was requested by Mr. Arun Prashan.

Sunday, August 17, 2014

Cellphone Controlled Car Starter Circuit

The post presents a simple cellphone triggered remote control circuit that can be applied as a cellphone operated remote car starter. The unit would cost less than $20 to build.

Saturday, August 16, 2014

3.7 V Class-D Speaker Amplifier for Differential Analog Input

A class D amplifier is basically a category of amplifier in which the power devices (mosfets and BJTs) are operated like switches.

Making a Small Induction Cookware

The post explains a simple small induction cookware heater circuit or an induction kadai circuit. The design is a low tech, low power design, and may not be on par with the conventional units. The circuit was requested by Mr. Dipesh Gupta

Sunday, August 10, 2014

Switching OFF Lights in a Periodic Sequence

 The post explains a circuit that will switch off a group of lamps in sequence with a predetermined delay rate, as set by the user through a built in pot. The ideas was requested by Mr. Azam Jamal
Readers are advised to proceed with the construction of the presented circuits only after understanding the concepts from the core. Not adhering to this can lead to failures and frustrations.