Thanks Suzy for the references.
But I ordered them from Ebay, a lot cheaper
Cheers,
Jacques
That's cheap. I paid AUD$62 in postage to Australia for AUD$53 in parts.
The website is pretty dysfunctional but I got there in the end.
I have ordered from Future Electronics quite a few times without any issue. Although the first time they did a follow-up call (I think it was their marketing department) wanting to ask me stuff. I told them I was just an engineering student and maker/DIYer who bought the cheapest PicKit4 he could find from an authorized distributor. They often have really good prices on capacitors and diodes compared to other distributors. So if you have to order there anyway, you might as well grab a few standard parts while you are at it.
@Bangla: Did you get the PCBs yet?
@Bangla: Did you get the PCBs yet?
Hello knOppers yupp got the boards. Thank you.
I have had a call from a questionable number 04477....i remember, could this
be F.E.?
I have ignored this....thats maybe the reason for trouble now.
And because i like the Board very much i have tried my own to route out.
I ended up a bit larger...
I have had a call from a questionable number 04477....i remember, could this
be F.E.?
I have ignored this....thats maybe the reason for trouble now.
And because i like the Board very much i have tried my own to route out.
I ended up a bit larger...
Attachments
Made some progress on the Lil’ 50 watter. Drilled, tapped and mounted amp boards to their heatsinks. Applied power to each channel and they fired up drama free. Bias is adjusted to 60mA with very low offset 3-4mV.
I noticed that Q12/14 and Q16/18 get quite toasty, approximately 52°C. Is this normal Suzy?
I noticed that Q12/14 and Q16/18 get quite toasty, approximately 52°C. Is this normal Suzy?
Attachments
Last edited:
No shares, just following what my dad trusted
I’m hoping to get first sound tomorrow, I’ll rig up temporary input/output connections. I still need a few bits and pieces for the chassis.
The 3503/1381 BJT’s are running over 50°C, just wanted to check if that’s normal? Thanks.
Yup, they run reasonably warm. They're biased at around 10mA, which provides plenty of current to push the lateral gates around. At 40V supply they're dissipating 400mW each, so given ~100˚/W junction to ambient for the TO-126 they run at around 40˚ above ambient.
In practice I haven't had any issues, however I did make allowance to heatsink the TO-126 transistors with a small strip of metal.
In practice I haven't had any issues, however I did make allowance to heatsink the TO-126 transistors with a small strip of metal.
Hot off the workbench! Suzy’s little 50w LatFet amp is singing
+/-40vdc, 65mA bias and 0mV offset. Mated with a Hypex SMPS, this is a super compact amplifier, outside chassis dimensions: 260mm x 310mm x 65mm.
Nice and quiet background without any hum. I still have to tidy up some wires and mount the front panel LED.
Thanks for sharing this neat little amp and supplying the wonderful build guide Suzy!! Looking forward to your Class H, Hehe
+/-40vdc, 65mA bias and 0mV offset. Mated with a Hypex SMPS, this is a super compact amplifier, outside chassis dimensions: 260mm x 310mm x 65mm.
Nice and quiet background without any hum. I still have to tidy up some wires and mount the front panel LED.
Thanks for sharing this neat little amp and supplying the wonderful build guide Suzy!! Looking forward to your Class H, Hehe
Attachments
Case looks like this one:
2607 All aluminum amplifier chassis / Class A amplifier case / AMP Enclosure / case / DIY box ( 260*70*311mm)|amp enclosure|aluminum amplifier chassisamplifier chassis - AliExpress
Vunce,
Well done - that's a nice build you got there.
2607 All aluminum amplifier chassis / Class A amplifier case / AMP Enclosure / case / DIY box ( 260*70*311mm)|amp enclosure|aluminum amplifier chassisamplifier chassis - AliExpress
Vunce,
Well done - that's a nice build you got there.
Thanks for the kind words everyone. No blue lights for me Suzy, old fashioned red
@ Zman,
Nice job! That looks like the same case. I’ve had mine stashed away for quite a long time and don’t remember what the model number is.
Not much listening time yet, just about an hour or so last night. But, no pops or thump! at shut down....
@ Zman,
Nice job! That looks like the same case. I’ve had mine stashed away for quite a long time and don’t remember what the model number is.
Not much listening time yet, just about an hour or so last night. But, no pops or thump! at shut down....