diyAB Amp The "Honey Badger" build thread

[Toastmaster1973]

How is the IEC wired now? Just in case someone else has the same problem. Thanks

 

[RickRay]

Which speaker protection board? Any chance one of the mounting screws shorted something. Since you have no amp boards yet, a transformer humm would mean WAY overloaded.

 

[Chiptech]

RickRay,

I used the diyaudio store speaker protection board.

 

[Chiptech]

I'm unsure on the LED orientation see photo. The arrows point to positive? I've searched the forum for guidance, not no help was found.

 

[RickRay]

Yes, the diode symbol side with the line is the negative side. That's how I remember.

 

[RickRay]

I've used those boards before, might have something installed wrong. Can you post a close picture of the front and back side of the speaker protection board?

 

[thimios]

Insert the longest pin where arrows.

 

[jwilhelm]

The long pin isn't always anode any more. They switch them up sometimes to keep it exciting.

 

[RickRay]

LOL, I did not know that. I always check them on diode test scale, most will light up when the correct polarity, not always.

 

[jwilhelm]

I learned that one the hard way. I always test them now too.

 

[thimios]

The long pin isn't always anode any more. They switch them up sometimes to keep it exciting.

Not happen to me ...yet.
Then a battery and a resistor is the best tester .
Analog multimeter's red test wire is the battery minus pole,capable of confusing anyone unsuspecting.

 

[NSP]

Question, do you need all kinds of bleeder resistors and snubber caps in the honey badger psu? I was thinking of going simple with just trafo, bridge rectifiers and cap bank. Nothing else.

 

[jwilhelm]

Bleeders are nice for safety but not needed really. All the CRC resistors actually cause a saggy supply. They aren't needed for an amp with any PSSR like the Honeybadger. Snubbers are nice to have but not absolutely necessary. Standard diodes aren't as noisy as ultra-fast switching so they are likely a better choice with no snubbers.

 

[Chiptech]

I'm ready to test a HB amp board. I'm pretty sure I've read that it's possible to just test the IPS & VAS first, without the driver transistors installed, but I can't seem to find much to confirm that approach? ChatGPT advises against this approach. So I guess I will go ahead and install the remaining transistors.??

 

[bullittstang]

Look at Section 16 in the Build Guide - walks you thorough how to test both the IPS/Amp board without outputs installed. Also shows you how to test the IPS board all by itself.

 

[Chiptech]

Section 16 of the Build guide? This is the only guide I'm aware of.

 

[NSP]

I think bullittstang is mixing this with the wolverine build guide.

 

[Kay Pirinha]

ChatGPT advises against this approach.

Now please ask ChatGPT the following question: A half bald head has 1000 hairs. How many hairs does a completely bald head have? I bet the answer will be 2000 hairs. So, what's the validity of ChatGPT answers?

Best regards!

 

[jwilhelm]

The amp should operate if you add a resistor in place of the output devices between the base and emitter connections. One resistor per rail would be all that is need. Likely something around 100 ohms would be good. This would be needed to make the feedback circuit complete.

 

[takitaj]

Here's the construction tips from earlier in the thread. It is doable and tip C. I believe is what you're looking for. I also attached another list of tips of I have from when I built mine in 2012. Still a great amp! I know it's a long thread but it's a good idea to make the time to read through it for other changes/tips & builder experiences. There's also some other options & changes depending on parts used in this and the other HB thread.