diyAB Amp The "Honey Badger" build thread

[AcousticWarfare]

element14 has 2x40V to 2x55V 625VA Vigortronics toroids for $107 GST included. You need to back order these but multicomp are available but $50 or so more expensive. Primary is 230V (2x115V) so you get 4% higher rails.

Best and not too expensive output devices are njw1302 / 3281, have better SOA than mjl4xxx series at half the price.

cheers,

Cool, thanks for the reply. I ended up going with the Antek supply suggested in the BOM as well as the suggested transistors as I had already purchased them. Im happy with the Antek as I can also use it to power the speaker protection board.

 

[AudioSan]

Does anyone know if I can use RN55 (or CMF55 Industrial) vishay dale resistors for every 1/4w and 1/2w value? I am sure for the 1/4w because they are rated at 0.25w@125°C but they are also rated at 0.5w@70°C. What do you think?

No. RN55 resistors have too thick leeds. they can not be more then 0.55mm.

 

[tesla005]

No. RN55 resistors have too thick leeds. they can not be more then 0.55mm.

Thank you for your reply. What kind of good resistors from mouser do you recommend? Also, apart from the lead diameter, what about power rating? This is what I want to know. 0.05mm can't stop me.

 

[AudioSan]

There is not too many 0.5-0.6W resistors that have lead diameter under 0.6mm.
I used TE Connectivity LR1 series 0.6W resistors for my build. They are 0.55mm.
But i don't know if mouser have this resistors. I got mine from RSonline.

 

[tesla005]

Ok so probably I'm gonna order a couple of different resistors and test if they fit and particularly for the RN55s I will test if their temp rises a lot when they dissipate 1/2w.

 

[AudioSan]

just check the datasheet. But you will find that most 0.6W resistors have 0.58-0.6mm lead diameter.

 

[tesla005]

Ok thank you I' probably get rn55s for 1/4w and the ones you used for 1/2w.

 

[dijwim]

After a couple of weeks working on a housing for the badgers that is inspired by Cambridge Audio, I am happy to share the result:

 

[Harry3]

Awesome!!!
Did you make the case?

 

[dijwim]

Awesome!!!
Did you make the case?

Thanks!

Yes, all of it was aluminum sheets. Bended the edges myself using a diy bender made from a tree support post and broomstick.
And a lot of sawing and filing, and some aluminum profiles.
All in all a months work in the evening hours and weekends.

 

[helitim]

@Dijwim ,

Very nice! Did you taper the heatsinks, or buy them like that? Either way, it looks great.

Cheers!

 

[dijwim]

@Dijwim ,

Very nice! Did you taper the heatsinks, or buy them like that? Either way, it looks great.

Cheers!

Thanks, I used a belt saw to taper the heatsinks by 20 degrees, then a lot of sanding, and then paint the top of them again.

 

[stuartmp]

After a couple of weeks working on a housing for the badgers that is inspired by Cambridge Audio, I am happy to share the result:

Very nicely done.

 

[thimios]

Honey Badger output

Who can post a scope test of Honey Badger output, without input signal{open input}?
Scope settings. 20mV/Div,20nS/Div

 

[helitim]

Finally got a work bench set up in the new house...

Easy progress today, the heat sinks are together.

I'm assuming this minor misalignment won't cause my any grief? It's a flaw in the casting.

 

[anatech]

Hi dijwim,
Amazing work! I really like that case.

-Chris

 

[anatech]

Hi helitim,
What oscilloscope is that on your new bench?

You might want to consider making a rack behind the bench for a growing suite of test equipment to preserve your working area. Just a thought.

-Chris

 

[helitim]

Hi helitim,
What oscilloscope is that on your new bench?

You might want to consider making a rack behind the bench for a growing suite of test equipment to preserve your working area. Just a thought.

-Chris

It's a Sencore SC3080. Less than 10 hrs on it. It was sitting in storage for a long time, but appears functional. I have all the original documents as well.

I actually kept my old kitchen cabinets and some shelving for my "shop". Right now it's just a temporary set up . I have a room that's approx. 16'x26' to use

 

[still4given]

Who can post a scope test of Honey Badger output, without input signal{open input}?
Scope settings. 20mV/Div,20nS/Div

I hope this is what you're looking for. Hmm, no idea why it turned it sideways.

 

[thimios]

I hope this is what you're looking for. Hmm, no idea why it turned it sideways.

Thanks Terry!
I hope this will be useful to my friend.
If it is easy ,can you tell what are the bjt,at the input,vas,driver,output?