Like our previous post on low and medium impedance preamplifier circuits, this tutorial shows a simple JFET preamp circuit that gives very high input impedance. The circuit works good with weak signal sources like microphone, guitar pickup or sensor and also it uses a N-channel JFET 2N5457. This Simple High Impedance JFET Preamp Circuit is […]
Mini Projects
Simple LM337 Based Precision LED Driver Circuit
LED needs stable current and when current becomes high then LED may burn, therefore, a regulator circuit is useful. This article is for Simple LM337 Based Precision LED Driver Circuit which is an negative adjustable voltage regulator but however, it can also control current; further, in this circuit the LED current stays stable and even […]
Transformerless LED Display Circuit using Capacitor Dropper
Many small electronic devices use LED displays, although a transformer based power supply is common, it increases the size and cost of the circuit and therefore, a capacitor power supply provides a small, low-cost, and easy to build alternative to a transformer based power supply. This circuit uses a capacitor dropper power supply to convert […]
2N3055 Based 12V DC Voltage Regulator Circuit
This post is for simple 2N3055 Based 12V DC Voltage Regulator Circuit, which gives stable 12V output and is useful for power supply projects; for example, battery charger, amplifier supply, small lab supply and this circuit is easy to build. The circuit uses low cost, readily available components and it operates as a series-pass transistor […]
One Shot Timer Touch Switch Circuit
Today we designed a simple One Shot Timer Touch Switch Circuit, which works like one shot timer; when we touch the touch point the output becomes HIGH for few seconds and after that, it goes LOW automatically. This circuit uses IC 4011 and it is CMOS NAND gate IC which works on 9V battery and […]
Touch ON OFF Switch Circuit using IC 555 Timer
Today, in advanced world, electronic touch switches are becoming very popular, they replace mechanical switches and therefore, there is no moving part, so its life is longer. This Touch ON OFF Switch Circuit using IC 555 Timer works as a bistable multivibrator and when we touch the touch point the output changes its state, that […]