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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Old 17th September 2018, 02:59 AM   #281
yourownbuzz is offline yourownbuzz
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for people who are getting ready to order parts - came across another supplier while looking up parts for another project - arrow electronics. they do free shipping with no threshold worldwide, and seem to be cheaper on some parts.

www.arrow.com
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Old 17th September 2018, 03:59 AM   #282
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Quote:
Originally Posted by hallcon83 View Post
Hi all, I have been having some major medical drama around here - in and out of surgery , in and out of the Emergency room many times , in and out of surgery Again --- so I missed the the buy . . . so I was wondering if anyone has any extra Pcb's they would be willing to part with? I would be very grateful - Thank you, Dean
Sorry about your health issues. Hope you are feeling better. I have more boards, just send me a PM with your PayPal address, number of board you need and country to ship to. Cost is $28ea and shipping is $5 in US, $12 Can, $15 everywhere else.
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Old 24th September 2018, 12:17 PM   #283
oxothuk is offline oxothuk  United Arab Emirates
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Originally Posted by xrk971 View Post
I wonder how LDOVR.com manages to make the TPS7A3301 programmable? The datasheet shows that you need to use 2 resistors according to table 2 according to relation:
R1=R2x(Vout/Vref-1).

Maybe it's a different LDO chip? But looks like the TPS7A3301:
TPS7A3301 Ultra Low Noise LDO Voltage Regulator
it's Magic, but can be sure that it is original TPS7A3301
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Old 24th September 2018, 03:13 PM   #284
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
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it's Magic, but can be sure that it is original TPS7A3301
Hi Oxothuk (Alexey?),
Thanks for chiming in - can you make these with a small pot built in? You make top notch stuff with genuine quality parts, I totally agree.
Regards,
X
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Old 25th September 2018, 12:09 PM   #285
oxothuk is offline oxothuk  United Arab Emirates
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i don't like the idea to use variable resistors within ref voltage circuit for low noise application
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Old 25th September 2018, 01:01 PM   #286
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
In that case some micro dip switches to set voltages quickly might be nice.
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Old 26th September 2018, 02:44 PM   #287
avtech23 is offline avtech23  Australia
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Originally Posted by xrk971 View Post
...I have more boards, just send me a PM...
I was trying to get hold of some boards back in July. Do you have any extra available at all?

Cheers
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Old 26th September 2018, 08:18 PM   #288
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
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I was trying to get hold of some boards back in July. Do you have any extra available at all?

Cheers
Yes, how many do you need?
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Old 27th September 2018, 10:33 AM   #289
avtech23 is offline avtech23  Australia
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
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Yes, how many do you need?
PM sent thanks!
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Old 27th September 2018, 03:58 PM   #290
xrk971 is offline xrk971  United States
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Simple High Performance DC Coupled Class A HPA with sub PPM THD
Hi Avtech,
Your board will go out tomorrow to Oz.
Thanks,
X
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