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 application. This circuit is a modification of the diode-OR connection circuit. The linear regulator is formed by the U1’s internal gain coupled with the PFET(Q1). The diode-OR connection is connected to Q1’s source that will act as USB power supply. […]

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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: amplify the signal with a consistent/stable gain without altering the waveform. A stability of its gain make it possible to make a precise volts/div scaler with no drift in time and ambient temperature. The requirement to reproduce the signal without […]

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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 system (before adding the tone control). Very simple circuit can be built using Baxandall configuration, which uses only capacitors, resistors, and one transistor. The firs potentiometer give treble cut and boost. Note that the potentiometer is connected to the amplifier […]

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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 it only need single supply voltage of 4 to 30 V. This circuit can give 100 percent pulse-width control.  A1 op-amp forms a 1 kHz oscillator, generating a square wave oscillator for the basic oscillation. A2 is a ramp generator […]

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