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Posts tagged meter

VU Meter using a lm3915 Circuit diagram

LED current drive is regulated and programmable, eliminating the need for current limiting resistors. The IC contains an adjustable voltage reference and an accurate ten-step voltage divider. VU meter uses just one IC and a very few number of external components. It displays the audio level in terms of 10 LEDs. The LM3915 is a […]

Schematic diagram for a broadband QRP SWR metering circuit and SSB TRANSCEIVER 80M / 40M boster filter IF Radio

A schematic diagram for a broadband QRP SWR metering circuit for use in a QRP antenna tuner. One could simply hold a momentary DPDT switch down and watch the LED while tuning the capacitors of the antenna tuner for minimum or zero light.

audio beep Circuit

Relay driver circuit – RELAY DRIVING BASICS

Relay driver circuit – RELAY DRIVING BASICS

PCB Layout and Design – CADint PCB

PCB Layout and Design – CADint PCB

RF circuit using 2SA1037K , UN 2112

RF circuit Design information RF circuit using 2SA1037K , UN 2112

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