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This universal down mixer circuit diagram is designed in the case of AM-broadcast receiver modification to enable them as DRM-reception. This universal down mixer circuit works at 7-20V supply voltage range, less than 6mA current consumption.
An automatic antenna switch circuit diagram is shown in the following schematic. It uses the LM3914 integrated circuit which the output is used to activate transistors as switches to provide 12V DC for the remote coax relays.
The LP2954 doesn’t have an electronic shutdown built in, the circuit diagram bellow performs how to add external shutdown function to this 5V LDO regulator that provides 5V output at load currents up to 250mA.
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