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Author Topic: Agilent 33250A function gen output amp replacement  (Read 1275 times)

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Offline feedback.loopTopic starter

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Agilent 33250A function gen output amp replacement
« on: February 13, 2023, 01:04:06 am »
This is an attempt to come up with a replacement for Agilent hybrid output amplifier in 33250A function generator. The prototype almost works, but shows some sort of instability at the very limit at 80MHz and 10Vpp output.


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Offline w1k

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Re: Agilent 33250A function gen output amp replacement
« Reply #1 on: February 13, 2023, 09:11:48 am »
Maybe the adjustment can help? It requires additionall power meter and 20db att.


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Offline HighVoltage

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Re: Agilent 33250A function gen output amp replacement
« Reply #2 on: February 13, 2023, 10:58:07 am »
Very nice repair!

At these frequencies the perf board might have a big influence and it will look much different, when you design your new PCB.

Looking forward to your next step.

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Offline anotherlin

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Re: Agilent 33250A function gen output amp replacement
« Reply #3 on: February 13, 2023, 06:18:15 pm »
Very nice repair video.

As a follow on project, it would be great to make it an open-source standalone module, that can be build by anyone in need of a 80MHz (maybe make it up to 100MHz since the IC looks like capable of more) signal output driver.
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Offline feedback.loopTopic starter

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Re: Agilent 33250A function gen output amp replacement
« Reply #4 on: April 18, 2023, 07:04:27 pm »
Part 2. A board was designed, and the new version of the amp was tested. After some tweaks it seems to work.


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Offline HighVoltage

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Re: Agilent 33250A function gen output amp replacement
« Reply #5 on: April 18, 2023, 09:43:53 pm »
Very nice work you did here with the replacement !
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