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This is a 1-watt stereo audio amplifier circuit utilizing the TDA 7053 integrated circuit from Philips. It is specifically designed for battery operation, delivering 1 watt per channel from a 6V DC supply. The circuit operates optimally between 6V...
This is a voltage converter designed to output a voltage range of ±1.25 to ±30V from an input voltage of ±35V. A three-terminal voltage regulator is utilized to achieve the desired voltage transformation in this unit. The voltage converter employs...
The internal telephone circuit is depicted below. By making minor enhancements to a toy telephone, it can be transformed into a functional internal telephone. This device comprises several components, including the phone unit, a decoding circuit, a ringing circuit,...
Based on Valvo FD-1A module, TBA120, and MC1310. Operation of the receiver is based on the phase locked loop principle. The FD-1A contains an RF amplifier, oscillator and mixer (made with BF324, BF451 and BF324 transistors, respectively). Tuning is...
This small FM transmitter can be modified to replace the microphone with an audio jack, allowing it to connect to an MP3 player for audio playback through car audio systems. The design is straightforward and intended for a short...
A 12V power supply is available, and there is a need to power LEDs with a forward voltage of 2V. It is questioned whether only six LEDs can be powered or if the cathode of one LED can be...
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