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R15 and ADE-1 mixer getting very hot

 

In the files section!

At 29-04-2017, you wrote:
Curious as to where the schematic using the ADE-1 is.
Mike
K5ESS
 

Sarma,

Insulation breakdown is highly unlikely. William has replaced them and all can't be having the same problem.

When the problem is found you will see how simple it was! this is my experience from many decades.

At 28-04-2017, you wrote:
raj jee,
? There is no heat without ade-1 in place even if the pins 1and 6 are connected with a wire to maintain continuity.
?
Thus it is clear that the trafo inside the mixer covering pins 1&6 is f\getting breakdown (short under real voltage application) to the secondary? and that has middle ground.

Perhaps it would be easy to check placing ade-1 on board and isolating pins 4&6? from ground. later one could connect one by one? pins 4 and 6.
It would show up?

? I finally suppose a case of insulation break down, in real working condition.
regards
? sarma
? vu3zmv
 

Hi William,


no more news from you. Did you find the problem?

From your reporting of Q7 disconnection and still have problem with R15 heating up there could be a short to gnd at pin 6. This would heat up the ADE LO transformer also.

The other case where the mixer and R15 would get hot is if the RF or IF pins would be shorted to gnd as this would be reported as a short to LO, but removing Q7 the only point is a short at pin 6 as if at pin1 only R15 would heat up.


73

Gian

I7SWX
 

Hi Mike,

also for me was not posible to find the schematic using ADE-1. I got the one with SBL-1 and redrawn the mixer part with the ADE-1 as positione on back of pcb. Herewith is the drawing.


73

Gian

I7SWX

BITX3_C_3 ADE MIX.png

 

Gian
I had uploaded the ADE-1 based schematic. you can see from my post. all the best
sarma
?vu3zmv


On Mon, May 1, 2017 at 3:46 PM, Giancarlo via Groups.Io <i7swx@...> wrote:

Hi Mike,

also for me was not posible to find the schematic using ADE-1. I got the one with SBL-1 and redrawn the mixer part with the ADE-1 as positione on back of pcb. Herewith is the drawing.


73

Gian

I7SWX




--
Regards
Sarma
?
 

Hi Sarma,

I found it, thank you very much.

73

Gian

I7SWX
 

Mike

/g/BITX20/files/Bitx%20Version%203%20B/Bitx%20Version%203C/bitx3c.sch.updated.pdf

it is here

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