Hello Shaan, I still haven't received the shippement. could you please send me the tracking number?
Thank you!
Sent to PM.
Sent to PM.
Message received; thank you Shaan!
Hi Shaan
i have just assembled 2 module but i have problem.
I have used 42v with all mods (mje340-350,mur160.330Ω)
The multimeter on R29 shows 750mv and after 2 minutes i had smoke from R5.
All the construction seems to be ok.
Have you any idea?
R29 should show less than 750mV. Could be faulty BJTs or oscillation. Can you upload a couple pictures?
Both modules have the same behavior
The MOSFETs are probably fine.
What small signal bjts are you using?
Do the LEDs light up when module is powered?
What is the LEDs' voltage rating?
As long as the small bjts and c5/6 are okay the resistor should not burn. The high VAS current suggests the input transistors are passing a lot of current. The CCSs limit current via the 1K resistors in series. If the 100R is burning that means the current is coming from ground, possibly via faulty C5. That's why I asked to test the 2200uF.
BC557 has maximum rating of 45V. So 42V is a little too close to safe operation limits. Try replacing them with 556.
BC557 has maximum rating of 45V. So 42V is a little too close to safe operation limits. Try replacing them with 556.
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