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Whats inside a Feeltech FPA-301? Better than Juntek DPA-2698 ??
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Noy:
Hi boys and girls :-D
I'm searching for an power amplifier for my Rigol MSO5000 AWG.

Currently there are 3 options:

OPA541 "Evalkit" from Ali (smallest BW / highest current):
https://de.aliexpress.com/item/33001238633.html?spm=a2g0o.detail.1000060.1.146e24afew9ZG4&gps-id=pcDetailBottomMoreThisSeller&scm=1007.13339.169870.0&scm_id=1007.13339.169870.0&scm-url=1007.13339.169870.0&pvid=ef788863-40a5-4ec3-b430-e048d9ff13ad&_t=gps-id:pcDetailBottomMoreThisSeller,scm-url:1007.13339.169870.0,pvid:ef788863-40a5-4ec3-b430-e048d9ff13ad,tpp_buckets:668%230%23131923%2393_668%23808%233772%23904_668%23888%233325%238_668%234328%2319935%23698_668%232846%238111%23445_668%232717%237565%23788_668%231000022185%231000066059%230_668%233468%2315608%23167

Juntek DPA-1698 / 2698 (currently my prefered device i think):
For 2698 there is already a thread with the internals. I think DPA-1698 is a kind of this design with less capaple output stage?

Feeltech FPA-301 (different verions available 5/10MHz / 10/20W):
Whats inside the devices? Can anybody provide pictures / informations? Reviews?

Which ones do you think ist best bang/buck?

Noy:
Nobody knows whats inside? / If they are good / meet the specs?
maxwell3e10:
I'd be curious too. DPA-2698 is described here https://www.eevblog.com/forum/testgear/juntek-dpa-2698-10mhz-signal-amplifier-digilent-analog-discovery/  I am suspicious of the power supply, but the output stage seems fine.
I suspect DPA-1698 probably has OPA541 or similar.
Btw, there are inexpensive amplifiers like that  with a linear power supply on e-bay, search for PASCO CI-6552A POWER AMPLIFIER.
Feeltech FPA-301 power spec is clearly off. Even taking peak values of 1A and 14V peak one does not get 20 W.  I suspect its similar to DPA-2698 except all 4 output buffers are in parallel.


Noy:
Thx for the hint. Unfortunally i'm located in germany and in eBay the amplifiers are all US devices. Shipping costs more than 50€  + tax..
The  PASCO CI-6552A looks like it is only kHz bandwith. I need at least 5Mhz.
Hm i think i will buy the DPA-2689 its cheaper than FPA and as long as i dont know whats inside it could be more worse than DPA.
Or i will build it my own but i think this would be more expensive than buying / modding for example add another connector to dpa to use my bench supply if its to bad inside.
Tjuurko:

--- Quote from: maxwell3e10 on November 03, 2020, 03:17:30 am ---I suspect DPA-1698 probably has OPA541 or similar.

--- End quote ---
DPA-1698 collected from XL6012E1 (XLSEMI) and two LM1875C (UTC).
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