An Old School Transistor Shunt Regulator
I had some time to kill on a recent rainy monsoon night, so I decided to brush up on my knowledge of basic shunt regulators. Luckily, I had a lot of BJTs and Zener diodes […]
5V Microcontroller Power Rail Guard
This 5V microcontroller power rail guard is a quite simple solution to add an overvoltage protection (OVP) mechanism between the 5VDC power source and your microcontroller board. In short, this little design uses a Zener […]
Doorbell Sensor IoT Module (v1)
In this post, I will attempt to share the design idea of a doorbell sensor that can be build using just a handful of inexpensive and easily available electronics components. When cleverly integrated into your […]
4V SLA Battery Charger
Pretty little 4V Sealed Lead Acid (SLA) or Sealed Maintenance Free (SMF) batteries are widely used in portable electronic gadgets such as mosquito bats, kitchen scales, healthcare instruments, etc. The most common 4V SLA rechargeable […]
Poor man’s AC230V Smart Plug v1
Recently I have received a few messages from a follower who is interested in making a simple relay box that will help him operate some regular electrical devices using the control signal from a common […]
Inverter Crystal Oscillators & A Half-Baked Project
This post describes the construction of basic crystal oscillator. The key parts in the experimental setup are a KDS4.000 quartz crystal (4.000MHz) and a SN74HC04N hex inverter IC. It should be easy to use an […]
Mixtile Core 3588E system-on-module works with NVIDIA Jetson TX2 NX carrier boards
Mixtile has just unveiled 18% OFF discount for pre-ordering the Core 3588E. Mixtile Core 3588E System-on-Module (SoM) is driven by the potent RK3588 chipset, delivering impressive performance while consuming minimal power. Key features of this […]
Window Comparator Revisited
Circuit configuration of a Window Comparator usually consists of a pair of inverting and non-inverting voltage comparators in which the output indicates whether an input signal is within a voltage range defined by two different […]
Lazy LED Flasher – Learner’s Edition
Every once in a while, I have found myself needing a quick circuit to blink a light emitting diode. It is quite easy to build simple microcontroller circuits which performs this task thru a few […]
Decade Resistance Box & A Cheap Substitute
The decade resistance box is an indispensable test gear for any electronics lab as it can be used to substitute different values of resistors during prototyping and/or experimenting with electronic circuits. Using it is easy […]