SKU: 72861823376

High-fidelity circuit design

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Description

High-fidelity circuit designCrowhurst and Cooper wrote many high fidelity design articles for Radio Electronics in the early 1950 ies. Gernsback had the original authors edit, rewrite and assemble them into this book. The aim was to provide design information for the enthusiast without much formal education, as well for those with advanced understanding of the subjects, but needing some help to visualize problems in tube based Hi Fi design. Sixty years later, we have better

Crowhurst and Cooper wrote many high fidelity design articles for Radio-Electronics in the early 1950-ies. Gernsback had the original authors edit, rewrite and assemble them into this book.
The aim was to provide design information for the enthusiast without much formal education, as well for those with advanced understanding of the subjects, but needing some help to visualize problems in tube-based Hi-Fi design.
Sixty years later, we have better methods and means to design audio, but basic facts, figures and ideas still stand, and the book gives interesting insights and backgrounds how things were done and why we are where we are today.

Part 1: Feedback: Feedback effects, Analysis and design, Response and stability, Distortion, Extending design factors;
Part 2: Design and Testing Techniques: Drivers and inverters, Power supplies, Attenuators, Filters and equalizers, Scope test procedures, Speaker systems, Advanced techniques, High-power amplifiers, Test equipment design, Improving old amplifiers.

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SKU: 72861823376

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Karla Jennings
Port Orchard, US
★★★★★ 5
Keeps my pet entertained 😊
Would highly recommend.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 3, 2026
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Bored_BloodletterofKorne
Belleville, US
★★★★★ 4
auto-rolling dog ball
I don't know what i'm doing wrong but my pets don't enjoy it. It's mobile on both settings. I think it just needs a place inside to place a treat or something. Quality seems okay. The battery lasts a long time. They chewed on it for a little bit and left it, the material is okay. It's made of some kind of rubber.
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Reviewed in the United States on May 5, 2026
T
TKibbs
Birmingham, US
★★★★★ 5
Fun, Interactive Toy That Keeps Pets Engaged
Summary: A smart rolling dog toy that helps reduce boredom and keeps pets active with minimal effort. Pros: Auto-rolling feature keeps play engaging Durable, chew-resistant design Encourages activity and mental stimulation Simple to use with minimal setup Works well for solo play sessions Cons: May be noisy on hard floors Not ideal for very aggressive chewers Battery life could be longer Movement pattern can feel repetitive Overall review: This interactive dog ball is a great option for keeping pets entertained, especially when they need something to do on their own. The auto-rolling feature is the main highlight—it moves unpredictably enough to grab attention and keep dogs engaged for longer than a standard toy. It’s especially useful for reducing boredom when you’re busy or not able to actively play. The build feels fairly durable and holds up well for regular chewing, though it’s probably not meant for extremely aggressive chewers. On hard floors, it can be a bit noisy as it moves around, and over time, the movement patterns may start to feel repetitive to more curious dogs. Still, it does what it’s designed to do—encourage activity and provide stimulation. Overall, it’s a fun and practical toy that adds some variety to a dog’s play routine.
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Reviewed in the United States on May 3, 2026
S
SibesOfSD
Bozeman, US
★★★★★ 5
Fun for an active dog!
I have an Australian Shepherd that absolutely loves this auto rolling dog ball! The ball is hard, but covered in a rubber coating. It is still loud when it hits the floor, but that is to be expected. My dog has chased this as well as thrown this ball, and it is still working flawlessly! This ball is definitely durable! It is easy to charge, and provides hours of entertainment! The ball is a great size for a medium dog. I recommend it!
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Reviewed in the United States on June 5, 2026
N
Nomadic Dogs
Pawtucket, US
★★★★★ 1
Auto-Rolling Dog Ball - loud with a mystery filling.
I got this to entertain my high energy dog and she does like it, but I don't. The ball is incredibly loud and doesn't move around nearly as much as I had hoped. When your dog picks it up, it turn their mouth into an amplifier making it louder. It bounces/vibrates around more than rolling. Which is not what I expected, but seems to be engaging enough for more dog (but that doesnt take much). What I really dislike is there is no way on the exterior to know what mode you are in and the inside is full of grease. To charge it and to see the lights to identify what mode it is involves opening it and touching the grease covered insides. The lights don't seem to match the instructions when trying to switch modes. The light is supposed to stay on for 3s. It doesn't for either mode and immediately cycles through other colors making it more confusing. The exterior seems durable enough for a moderate chewer and I like the color and texture. At $15, it seems like a fair price, but I can't recommend this at any price point. I don't feel comfortable letting my dogs play with toys that could easily expose them to an unidentified grease. Any greased components should be sealed. Not somewhere I have to touch for normal operation and potentially leak.
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Reviewed in the United States on April 4, 2026

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