Sunday, March 29, 2015

PIR Motion Activated Relay Circuit

The post explains a simple motion activated PIR relay circuit which can be used for activating lights only in the presence of a human, thus saving precious electric power.

Saturday, March 28, 2015

Automatic Door Circuit for Hen House

The articles discusses an automatic door mechanism circuit that responds to the ambient light conditions by keeping the door open during day time and closed during night. Here the application is used for operating a hen house door. The idea was requested by Mr. Gavin Sweet

Friday, March 20, 2015

Digital Christmas Candle Light Circuit

The post discuses a sequentially advancing 25 LED timer circuit which may be initiated  on the 1st day of December so that each LeD lights up on each day until the 25th of December (on Christmas) when all the 25 LeD can be seen lit up. The circuit was requested by Mr. Guy Mathews

Tuesday, March 17, 2015

Mains Over Load Protector Circuit for Lathe Machine

The article discusses a simple overload cut off circuit for safeguarding heavy mains operated machines such as a lathe machine. The idea was requested by Mr. Howard Dean.

Monday, March 16, 2015

Digital Voice Changer Circuit

The post explains a circuit which has the ability to change or transform an individuals unique voice into a completely new form.

Fan Speed Controller for Heatsink

In this post we study about a automatic fan speed regulator circuit for controlling the temperature of a heatsink and from preventing th etemperature to erach dangerous levels. This approach is to ensure safeguardign of the connected devices wit the heatsink.

Friday, March 13, 2015

100 amp Variable Voltage Power Supply Circuit

The post describes a  simple but extremely versatile 100 amp, variable voltage power supply circuit using just a few BJTs in parallel and in a common collector mode. The idea was requested by Mr. Andre.

Monday, March 9, 2015

220V DC Inverter UPS Circuit

The post discuses a simple 220 V to 220V DC online UPS inverter circuit. The idea was requested by Mr. Taiye.

Saturday, March 7, 2015

Infrared Remote Controlled Door Lock Circuit

In this article we learn about a simple infrared based remote control door lock circuit which can be used for securely locking doors through unique foolproof IR frequencies.

Battery Charging Fault Indicator Circuit

The article explains a battery status indicator circuit which is also capable of indicating whether the battery condition is good, bad or damaged. The idea was requested by Mr. Faizan.
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.
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