high level wideband rf preamplifier

A high-input-resistance operational amplifier (op-amp), a bridge rectifier, a microammeter, and several discrete components are necessary to implement this versatile circuit. This circuit can measure DC, AC RMS, AC peak, or AC peak-to-peak voltage by simply altering the resistor...

The proper operation of the squelch circuit in any FM radio is essential to avoid listening to discriminator noise. This is particularly critical in a repeater system. The primary function of a squelch circuit is to detect the presence...

There is no substitute for sheer power—low-efficiency speakers, outdoor sound systems, or perhaps the full dynamic range of a high-power amplifier. Whatever the requirement, this super power module should meet the needs. The amplifier can be divided into three...

Designers who build equipment for the industrial market share a widespread problem. At one extreme, they must build equipment that supports ±10V bipolar voltages, often riding on a high common-mode level, a requirement enforced by 30 years of legacy...

The design is based on the TubeHobby and serves as the power supply used in their NC2. This kit was constructed as an initial project involving nixie tubes, and a review of this excellent kit can be found in...

The voltage range will be from 0V to 24V, and the current is not expected to exceed 4A. A microcontroller and an LCD could potentially be added to measure voltage and current. The schematic appears to be generally acceptable....