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When USB power is present and the device needs to operate, VSupply is supplied directly by the USB, while a PMOS transistor isolates the battery from the supply. Resistor R3 ensures that the PMOS remains on when USB power...
The fan operates continuously in many PCs, which may not be necessary. A simple controller circuit can adjust the fan speed based on demand. This not only conserves energy but also minimizes noise irritation from the fan. Only three...
The timer U1 operates as a free-running oscillator at 60 Hz, providing trigger pulses to timer U2, which functions in monostable mode. Resistor R1 is fixed, while capacitor Cx is the capacitor being measured. The output of U2 is...
L1 and L2 were constructed by wrapping three tight loops side by side around a Sharpie marker. L2 was additionally created by wrapping approximately 8 inches of 35 AWG magnet wire around a ferrite core, ensuring that the windings...
An electrical signal from the low tension side of the distributor is converted into a voltage that is proportional to engine RPM, and this voltage is displayed on a meter calibrated accordingly. The 555 timer integrated circuit (IC) operates...
A low-frequency test oscillator designed for testing tone controls and conducting experiments. The low-frequency test oscillator serves as a versatile tool in audio engineering, particularly for evaluating tone control circuits and facilitating various audio experiments. This device generates sinusoidal waveforms...
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