In this post I have explained a simple 220V mains operated transformerless single rice bulb power supply circuit, which may be used for illuminating electronic rice lamp diyas replacing traditional oil lamp type diyas during festivals or for decorating sacred idols. The idea was requested by Ms. Rashmi. Technical Specifications I want to make a rice […]
Power Supply Circuits
12V, 24V, 1 Amp MOSFET SMPS Circuit
The post investigates a cheap Chinese made 12V, 1 amp MOSFET based smps circuit which can be modified into 24V 1 amp, or 12V 2 amp smps circuits also. The MOSFET used is STB9NK60Z which is a highly advanced, rugged 600V 7A device specially manufactured for high, unpredictable, voltage environment circuit applications. Reverse Engineering a 12V […]
Transformerless Relay Driver Stage
In this post I have explained an enhanced transformerles power supply circuit design which consists a well stabilized and regulated DC stage along with a relay driver stage which operates through an external pulse. he idea was suggested by Mr. Reza. Technical Specifications Reza: Dear Sir, I have a problem with one Circuit regarding converting […]
Connecting Voltage Regulators 78XX in Parallel for High Current
In this post we investigate how to connect popular voltage regulator ICs such as 7812, 7805 in parallel for acquiring high current output from the ICs. Voltage regulator chips mostly have their maximum current output specs fixed to some predetermined levels. Increasing them to a higher level would normally call for external out board transistors […]
1.5V to 12V DC Converter Circuit Diagram for LEDs
The post provides interesting information regarding the making of a 1.5V to 12V converter circuit using a couple of transistors and an inexpensive coil. The idea was requested by Mr. Keith. The Circuit Request I found your blog and have searched for an answer to my question but I’m just not finding it…. What I want to do […]
How Buck-Boost Circuits Work
We all have heard a lot about buck and boost circuits and know that basically these circuits are used in SMPS designs for stepping up or stepping down a given voltage at the input. The interesting thing about this technology is that it allows the above functions with negligible heat generation which results in a […]