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The FM Remote Control Receiver, found in the Infra-red circuits section of this website, features a connector that provides an analogue output. To create a simple intercom or public address (P.A.) system, a microphone pre-amplifier is required to ensure...
A lot of friends asked me to draw a more shrunk circuit 2-ch mixer, which will contain also, operation CROSSFADER. The circuits can be modified and added also other channels, repeating basic that I give. It can be added...
The MAR-x preamplifier is designed to operate within a frequency range of up to 1.5 or 2 GHz, depending on the selected MAR-x integrated circuit (IC). For applications requiring a low noise figure, ATTN1 should be omitted. Both ATTN1...
The heart rate measurement project utilizing fingertip photoplethysmography was constructed using salvaged components, specifically an infrared LED and a photodiode. Due to the nature of these parts, their specifications could not be provided in the article. The heart rate measurement...
The microphone preamplifier circuit design presented in this schematic utilizes the SSM2015 produced by Precision Monolithics Inc. (PMI), which offers high amplification. The SSM2015 is a low-noise, low-distortion integrated circuit designed specifically for microphone preamplification. It features a differential input...
The output of the condenser microphone is coupled through a 0.1 µF coupling capacitor, which serves to eliminate DC components from the audio signal. Transistor Q1 is configured in a collector-to-base biasing mode, achieved with a 470kΩ resistor. This...
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