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Re the use of a light bulb for Wien oscillator amplitude stabilisation. This may be of interest to the group, the late Jim Williams wrote an article titled "Max Wien, Mr Hewlett and a Rainy Sunday

Pete, others, that monograph is also available at https://archive.org/details/Q00012. The joy of the Internet Archive is that: a) no attachment is required b) frequently (as in this case) a Sandwich

Slightly OT: Hewlett's (or Meacham's) light bulb stabilization was a brilliant, elegant solution. As shown decades later by Barney Oliver, though, it is subtly and fundamentally flawed: The loop's

I agree about the methodology – leaves a lot to be desired. I just posted it for interest. Cheers, George Sent: Tuesday, 16 August 2022 4:56 PM To: [email protected]

Hi Dave, Paralleling transistors or amplifiers simply increases the current of phase correlated signals by a factor of N and of non-phase correlated signals (Gaussian noise for example) by a factor of

Hi Bruce: Some decades ago I was measuring microwave mixer spurs and started out with an HP 8350B and HP 8566 Spectrum Analyzer.? I quickly learned that the noise coming from the 8350B sweeper caused

As a followup to the discussion about minimizing noise for test instrument detectors, has any list meter attempted to increase the detection sensitivity of the venerable HP 415 VSWR meters by reducing

Hi Hans, this is a very nice writeup. Thanks for sharing. J Hans Wagemans wrote:

Nice calculator to compare some actual opamps http://www.dicks-website.eu/noisecalculator/index.html On another part of his website he demonstrates how a transistor before the opamps can improve noise

Putting devices/amplifiers in parallel or series produces a noise impedance transformation. Paralleling them increases the noise current, putting them in series increases the noise voltage. Depending

It decreases the equivalent input noise. If you’re interested, this is discussed in the Art of Electronics (3e) “8.6.1 Voltage noise of JFETs” and probably a lot of other sources as well.

On Sat, 20 Aug 2022 at 17:47, Matt Huszagh performance? What does putting the FETs in parallel achieve? I appreciate one can handle more current, but I assume that is not the purpose. I don’t know

Looks like a job well done, Good write up. Mikek

Please have a look to my website: https://on4cdu.net/noise-measurements-on-voltage-regulators/ The amplifier presented there is better than the measured 0.567 nV rms /√Hz (see text on the website)

"Erik Kaashoek" <erik@...> writes: This can be DC-coupled right? I'm designing something similar at the moment but primarily for ultra-quiet power

A Phase Noise Analyzer using a mixer and a reference source phase locked to the input signal requires an ultra low noise amplifier at the output of the mixer The output of the amplifier goes into a

This is the application area of the analog Differential Voltmeter. Adjust the % of range knob for desired meter sensitivity. 0.1% on the 1000V range would be +/- 1V. Infinite input impedance at null,

That's from TI AN-32 FET Circuit Applications. https://www.ti.com/lit/an/snoa620/snoa620.pdf Would be great if someone would generate a small surface mount component PCB for it. John

To be clear in the last paragraph, I mean something like 4V at the extreme left and 6V at the extreme right side. This helps eliminate one of the weaknesses of most analog VOMs.? If you have a

I deleted those last two meters but I guess the groups.io editor decided to keep them anyway :(