I haven't made any updates on the BOM yet but I think some changes in the connectors are needed. The other parts are basically the same I think.
I've started a new thread for the V3 Speaker Protector and also for the V3 Soft Start boards. Both include the updated BOM. Please ask questions specific to those boards in those threads. Cheers!
The build guide links to the wrong file. Could you please link the proper build guide for the DC protect board?
power supply confusion
hi guys, I know my question is a stupid question but I'm stuck. I've built my F5, it's working, sounds good, and I don't have any power on thump. So I'd like to add the dc protection board. Can I connect the X1,2 (power in of the dc protect board) to the f5 power supply (24v)? Can I share the same power supply?
hi guys, I know my question is a stupid question but I'm stuck. I've built my F5, it's working, sounds good, and I don't have any power on thump. So I'd like to add the dc protection board. Can I connect the X1,2 (power in of the dc protect board) to the f5 power supply (24v)? Can I share the same power supply?
The link for the "build guide" at Post #1 is indeed the wrong one. (....it links to the "Soft Start", not the "Speaker Protector".)
I've never seen the build guide for "Speaker Protector".
I'm wondering what the Green LED is supposed to indicate.
I assume it's just a "power ON" indicator.
If so, my boards (V3) are working properly.....I get perhaps 4 second delay to close/enable the relays.
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LED2 is just a power indicator. LED1 IIRC is meant to flash while the RC-circuit/timer on the board is running (output is disabled), then becomes constant once the relay's close (and your output is enabled).
Hello,
Excuse me, where is the original article about the speaker turn-on delay construction, connections and set-up?
Many thanks,
Best regards,
Orazio
Excuse me, where is the original article about the speaker turn-on delay construction, connections and set-up?
Many thanks,
Best regards,
Orazio
Hi All, I hope someone can give me some guidance here I have just finished filling the speaker protector board V2 and starting to test. When powered up led 2 is lit and led 1 is lit steady but does not flash as it is supposed to. The relays engage. Both DMM do read zero resistance. When I do the DC protection test I do not hear the relays disengage, no protection! I have checked the orientation of the transistors these are ok. I have used all the suggested components on the BOM. Transistors for T1 to T5 are KSC945CGBU and if i have read the spec sheet correctly have a pin orientation of ECB, and T6 is an 512-MPSA06 and pin orientation is EBC, so all transistors match the board layout. What else can i check to see what is wrong?
Quoting myself here, I dug the speaker protector out of a drawer (I had given up) and found a simple bad solder joint. The unit now works as advertised and passes the test when connecting the amp in to D6.
Is there a good way to test this board with a battery? At what DC voltage should the relay open?
Most will trigger @ 1.5Vdc from a battery.
Some will trigger slowly at this voltage, others trigger quickly.
The real test is to apply a half power to full power signal from the power amplifier and slowly decrease the frequency from 100Hz to 5Hz and see if it triggers cleanly when the frequency is below 20Hz. You don't want false triggering of audio frequencies that could be valid signals.
Some will trigger slowly at this voltage, others trigger quickly.
The real test is to apply a half power to full power signal from the power amplifier and slowly decrease the frequency from 100Hz to 5Hz and see if it triggers cleanly when the frequency is below 20Hz. You don't want false triggering of audio frequencies that could be valid signals.
Dumb question, but how is the battery connected? Negative to the amp circuit ground?
I'm having exactly the same issues with my V2 board. I don't have a record of what parts I used but I too followed the V2 build guide. What did you do to fix?
So I was re-biasing my amp and checking DC offset, and found 170mv DC on one channel and 60mv on the other. Turns out it's the speaker protector board putting this out, the amp is putting out zero. Is this normal? I took it out of the circuit for now.
Are you using this circuit? http://www.diyaudio.com/forums/imag.../P-SSSDP-2V20-speaker-protector-schematic.pdf
What you describe is not normal and I can't explain it. What exactly did you do when you took it out of circuit and where did you measure the offset?
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