![]() This circuit enhancement, at different times, has been found to be called by two terms. Or you might have a 30x gain transistor and end up with 60,000 ufd of equivalent capacitance. That 2000 ufd of capacitance, then becomes the equivalent of 20,000 ufd if the gain of the transistor is 10x. that separate and extra capacitance of C1 being supplied to that BASE of the regulator has an effect of then getting amplified by the gain of the transistor. That DC purity is even further assured by the second C1 capacitor which is being tied into that resistor voltage divider of R1 and R3. akin to that which you would be receiving from the units battery pack. The first C2 2000 ufd would be the normally expected smoothing capacitance, associated with levelling up the 50 or 60 cycles pulsating nodes coming out of VD1 to give you a pure smooth, ripple free DC voltage. and that would be the required filtering capacitances associated with that circuitry. That then lets the radio run from the T- transformer the VD1- rectifier block and the VT1- linear series pass regulator transistor. If you plug in the cord, the batteries are disconnected when that spring contact breaks from 3 and nudges over to 2 contact. If no power cord is plugged in, the spring contact between 2-3 routes the 6 cells of the battery On that, you need to be referencing to the extreme left bottom corner of the schematic.Īt its bottom left corner you see where the power cord is inserted. Your given voltages now tells us that you are using the units built in power supply. I was just initially thinking of all of the errant noises that could be occurring in the audio stages. if you analyze them proportionately and ratiometrically, they still look like good voltages for that circuit at that higher supply voltage.īUT it does introduce a new need to define the term of " distortion ", as being applied to the sound that the unit is presently making. They are being based on a 12.5 VDC supply voltage. looks like you have thrown in a new variable to the situation. with the latter 2 connections junctions possibly being easier to locate on the circuit board.Īhhhhhhhhhh yes, with those given voltage readings. If you end up having to find my referenced ORANGE test audio injection point, you can see that it is being a trifecta connection with the 3 common connections being to the looooong 14 pin slide/function switch connection 7 and R4 and C7. If you try the caps, in that replacement order, they might correct the problem with no further involve voltage tracking required. ![]() That is also where the ground shell of my mentioned patch cord carrying in a test signal would get connected, with its tip receiving a tacked on wire to reach on, to the orange circle test input. That almost encircles 3/4 of the board and also runs internally to the board and gathers scads of ground connections in all of its spread out directions. look at your very last photo submitted, and at the right bottom corner and just come in until you meet the first foil path. Look vewy-vewy-vewy carefully and you will see that 13 and 14 are being the SAME common ground connections that constitute a foil trace that runs around just about all of the PCB.
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