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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.

Circuit control temperature fan ceiling

P1_____________22K R1_____________15K R2____________100K R3,R6__________10K R4,R5__________22K R7____________100R R8____________470R R9_____________33K C1_____________10nF D1________BZX79C18 D2_________TIC106D D3-D6_______1N4007 Q1,Q2________BC327 Q3___________BC337 SK1__________Female Mains socket PL1__________Male Mains plug & cable R3-R4 and P1-R1 are wired as a Wheatstone bridge in which R3-R4 generate a fixed two-thirds-supply “reference” voltage, P1-R1 generate a temperature-sensitive “variable” voltage, and Q1 is used as a bridge balance detector. […]

Tutorial on Printed Circuit Board Design

Tutorial on Printed Circuit Board Design Printed Circuit Board (PCB) is a component made of one or more layers of insulating material with electrical conductors and perfection in the work required if expecting good results. Currently the main generic standards for the design of a printed circuit board, clean, neat, really tested the results. Is […]

Fm Receiver Radio Digital Circuit

Fm Receiver Radio Digital Circuit using SP3232EB, PIC24FJ64GA002, LM1117, LM7805

Simple electronic circuits

Police Siren simple electronic circuits R1 ………….. 27K ohm R2 ………….. 68K ohm R3 ………….. 56K ohm R4 ………….. 470 ohm C1 ………….. 50uF – 12V C2 ………….. 0,018uF – 25V TR1 …………. FCS9013 TR2 …………. FCS9012 S1 ………….. Push Switch Police Siren simple electronic circuits using FCS9013, FCS9012

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