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This device listens to conversations and then interjects words and phrases at inappropriate times. I got this box at a local thrift store for $1.50. It has a nice hinged top and a place to insert a panel with...
The range of this FM transmitter is approximately 100 meters when powered by a 9V DC supply. The circuit consists of three stages. The first stage is a microphone preamplifier constructed using a BC548 transistor. The second stage is...
This circuit generates clean logic pulses with minimal current consumption. It is designed to produce short 2 ms pulses at a frequency of one pulse per second, drawing only 1 microamp from a 9-volt battery. The described circuit operates efficiently by...
The circuit was designed to provide an adjustable power supply that is symmetrically configured, offering a voltage range from 1.25V to 30V at a current output of 1A. The adjustable power supply circuit is typically composed of several key components...
The objective of this project was to monitor power consumption in a residential setting. In addition to tracking total usage, the goal was to separately monitor and compare the usage of major appliances, such as the water heater, heat...
The potentiometer adjusts the trigger level. The diode in the circuit diagram is specified as 1N914, which is suitable for light-duty relays; however, since the 1N914 is a signal diode, it is not ideal for this application. A 1N4001...
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