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This is a simple USB FM transmitter designed to play audio files from an MP3 player or computer on a standard VHF FM radio. The USB FM transmitter operates by converting audio signals from a digital source, such as an...
A simple design based on a CS209A IC that can give surprising results and draws very little current from a 9-volt battery. It worked well on the bench but not so good outside for general metal detecting. However, it...
This device is designed for individuals seeking to achieve a tan while minimizing excessive exposure to sunlight. It utilizes electrolytic capacitors as one of its components. The tanning device operates by utilizing a controlled exposure mechanism that regulates the intensity...
This circuit diagram represents a microphone preamplifier, specifically designed to prioritize voice signals over other audio inputs. In its basic configuration, the circuit includes a microphone unit and a change-over switch that connects to an amplifier. When the push-to-talk...
Due to limited space, a small 6V battery is utilized, and the voltage is reduced by 1.2V to 4.8V using diodes D1 and D2. The PicAxe chip is employed in the circuit. In this circuit design, the primary power source...
Both circuits are used to control the thyristor contactor KM action to overcome the break phase protection relay prone to malfunction or refuse to move, and enhance the sensitivity and reliability of the protection device. The described circuits are designed...
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