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Posts tagged 안테나

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.

Portable Mic Pre-amp 2 transistor

Portable Mic Pre-amp 2 transistor using BC549C, BC547B

Projection 50″ TV, Power Supply Problem?

afterburner asked: Tried to paste a circuit diagram into this problem, but no luck. PROBLEM DESCRIPTION: Believe the problem is in the power suppy. Model: Hitachi CU 5002k 50″ 3 tube projection. No picture, raster or sound. I have no scope. Have VTOM. Output from the Sub Power Supply is, and should be, 122 VAC […]

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 […]

Booster Audio mixer circuit diagram

  Booster Audio mixer circuit diagram using KA22242 DUAL EQUALIZER PRE-AMPLIFIER WITH ALC The KA22242 is a monolithic integrated circuit consist-ing of a dual equalizer amplifier with ALC and Mute function, and it is suitable for stereo radio cassette tape recorders. APPLICATION INFORMATION DESCRIPTION OF KA22242 The KA22242 has a simple package, 10-pin and built-in […]

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