Yes X, I made a bit of progress on the Melbourne’s this evening.
Hi Vunce,
How is your build coming along?
You don’t need the lugs. Just insert directly into the holes/pads. The default gain is 15.6dB and is set by the (R118+R119)/R118 value of (5k6+33k)/5k6. If you want 30.6dB if gain use 1k for R118 etc. leave R119 at 33k.
Add some resistor lead clippings to the two test points to measure bias current though.
I think JP added feb lugs to allow easy de-soldering and exchanging of the gain resistor.
Add some resistor lead clippings to the two test points to measure bias current though.
I think JP added feb lugs to allow easy de-soldering and exchanging of the gain resistor.
Hi Zman!
It was going great until last night, a tiny solder bridge on the Yarra MB stopped me in my tracks
Two working Melbourne’s turned into zero.
Troubleshooting and repair tonight
Hi Vunce,
How is the trouble shooting going?
Hi Vunce,
How is the trouble shooting going?
Hi X,
The solder bridge was fixed quickly. The Melbourne’s were another story. I’ll give the short version though. After spending several hours checking/testing every component, the problem turned out to be faulty meter lead!!! The Melbs are all good
Hi batty, RS - Online here in OZ has the Fischer SK95-25-SA-220 heat sink in stock (their part number is 189-8319) and they are $3.77 AUD each incl. GST with 23 in stock for next day delivery. That is where I got mine from and are the same ones as shown in the original PCB build photo's.
Mesmerize is unity gain
With 15.6dB and 15.6dB of M2X, you have about 31dB overall which should be perfect for driving with a cellphone or usual RCA source.
TY Ordered.Hi batty, RS - Online here in OZ has the Fischer SK95-25-SA-220 heat sink in stock (their part number is 189-8319) and they are $3.77 AUD each incl. GST with 23 in stock for next day delivery. That is where I got mine from and are the same ones as shown in the original PCB build photo's.
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