MAX1703 Single-Cell Boost Converter Circuit
When you design a circuit with only a single-cell battery, you will need boost-converter to provide enough voltage for most ...
55MHz Scope Sensitivity Amplifier
Scope sensitivity amplifier is a vital front-end signal processing for every scope instruments. The function of this circuitry is simple: ...
Two-Band Bxandall Active Tone Control
Using active circuit for tone control means that we can provide cut and boost, maintaining overall amplifying factor of original ...
Pulse Width (PWM) Controller Circuit
A LM3900 quad operational amplifier can be used to build a pulse width (PWM) controller. The LM3900 was chosen because ...
Small TV Modulator Using A Motorola MC1374
How can television modulator be small and simple like this? First, it uses integrated circuit, and the second, any TV ...Balance Indicator for Symmetric Power Supply
Balance indicator for power supply show if a symmetric power supply is really symmetric or not. With two comparator pairs from a LM339N quad comparator we can make a such indicator. One pair drives the red warn LED3 and the … Continue reading
Two Methods for Push Button Controlled Power Switch
On these two following circuits, we can latch on the SCR (and thereby the lamp) by momentarily closing S1, thereby feeding gate drive to the SC via R1. The gate is tied to the cathode via R2 to improve circuit … Continue reading
Portable Calibrator: Stable 10V Reference
A stable voltage source is needed in many calibration process. Most electronic devices are affected by its surrounding temperature. To control all the components temperature by manipulating the surrounding temperature is not easy, but fortunately we can control only the … Continue reading
Long Interval RC Timer Using Op-Amp
With the help of high gain high impedance operational amplifier, we can build a long time delay with resistor-capacitor (RC) circuit since it allow high resistance resistors to be used. We can calculate the time (t) using the following formula; … Continue reading
