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Radio shack used to sell a board that they called a "Stereo Headphone Amplifier", which basically supported a pair of LM386 chips and supporting components. Some years back I found one at a hamfest

Hello , I tried to check the stability of the circuit by opening the feedback loop and placing the pertubation as shown below. How ever I made two plots Vf anole and Vf,Vin in AC responce and I get

I used an FPGA. Discovered could only do decade division, otherwise odd harmonics would be created. Never really had time to investigate. I pulled mine when on the roadside. I guess instilling the

I started to build a board that would give me a bunch of frequencies ilke that, nowhere near as fancy iu the oscillator part, but I never did get enough 7490 chips to finish it. It's probably still

Yeah. I have a stereo, along with an octave-band equalizer, in the other room that I haven't hooked up yet, since I moved over here. Which is something like 4-1/2 years ago? I used to have stuff

My first, and last, audio reference involved calibration whilst beating against WWV. That got real old, real fast, and started making recordings of decades and octaves from the tuner in band hall.

Their amplifiers have impressive specs, too bad 40 years of riding a motorcycle and being 73 make HiFi someone ridiculas. As to needing a 1kHz AF oscillator with 0.0002% distortion.....who said I

Some interesting stuff on that web site. It's pretty cool that they're into selling kits, as the outfits that used to ain't doing that any more. I don't see where I would need something like

I'm a sucker for test equipment, more so for good equipment at rock bottom prices. A friend dropped an inexpensive audio oscillator by for me to check

Hi Roy, further digging gives TE/AMP p/n 5414373-1 DigiKey Part Number (

If you are only interested in looking at audio on an oscilloscope, one decent method is to use a "high quality" USB audio interface. The Behringer UMC202HD is a decent unit that can be found at

That's what I was talking about. That document is the two peices of paper that came with the unit... I've save a copy of that, as I can read some of it a bit better than the actual print-on-paper

Hello, I have built a system shown below by the attached article.Its a frequency locked loop. basicky I am using a YIG as VCO to tune it exactly to the cavity resonator. The phase and amplitude of the

The document at https://jyetech.com/wp-content/uploads/2018/07/dso138-user-manual-13801k-13802k.pdf Shows the weirdest BNC female I've ever seen!

Hmmmm... I am intrigued. Their stuff is of reasonable cost, and appears to work adequately. I am sorely tempted.... Thank you for the info, John. Ken W7EKB www.w7ekb.com -- This email has been

Nope. -- Member of the toughest, meanest, deadliest, most unrelenting -- and ablest -- form of life in this section of space, ?a critter that can be killed but can't be tamed. ?--Robert A.

Without even looking at the link, I'd say probably. A bit of poking around tells me that this thing is commonly referred to as a DSO-138. The two numbers I ran across are apparently two versions of

Hi Roy, could this be the beastie? https://jyetech.com/dso-138-oscilloscope-diy-kit/ Cheers, John VK4ATU

Sight unseen, could the BNC be a reverse BNC? One where the nominal female has a male stinger? I've ran into them in the oddest places. The FCC requires reverse BNCs, TNCs, and SMAs on WiFi

Photo? Ken W7EKB