ELECTRONIC GADGETS

drallen · Mar 30, 2011

Does anyone out there have any of the latest gadgets such as iphone ipod etc. I am well into technology. I currently have 4 ipods, an ipad, computer, xbox, playstation. No wonder I can`t get any machining done. What is your latest toy?
Dave

mklotz · Mar 30, 2011

I just bought the newest Sony 500mw encabulator with the 3 meter antenna. It's really great. I don't think I've ever had such perfect toast before.

Troutsqueezer · Mar 30, 2011

drallen said:
Does anyone out there have any of the latest gadgets such as iphone ipod etc. I am well into technology. I currently have 4 ipods, an ipad, computer, xbox, playstation. No wonder I can`t get any machining done. What is your latest toy?
Dave

You must have a pretty big belt to fit all those gadgets on.

milotrain · Mar 30, 2011

I'm building a tube headphone amplifier, and got a capacitance meter to do some checking around the local junk yard.

should look sort like this when I'm done

Troutsqueezer · Mar 30, 2011

Good God, load lines, transformer-coupled stages, that takes me back.

Maryak · Mar 30, 2011

Latest gadget.

Ethernet over power for Galina's internet TV. Plus a Sig 340 internet set top box.

Best Regards
Bob

Tin Falcon · Mar 30, 2011

A laptop
Tin

Anko · Mar 30, 2011

A set of 2n3055 transistors for a very loud 100w pc subwoofer proyect :

Hey Milotrain I will love to see some pictures of your headphone amp!! :bow: Im also a tube lover and tube stuff amateur, And more that tubes I like almost all vintage styles: machines, amplifiers, old radios, hands tools etc..

I want to show you some of the tube equipment I have and still building, all ofcourse with a vintahe wood style:

This is my current guitar amp, unfinished and with a little dust on the top, has a N.O.S Tung-Sol 5881 in the power, I still have to make a new front panel, lacker the wood and made the letters of the logo to finish it totally:

the one in the top is a guitar preamp unit, and the other is a transistor audio amp

Saludos!

deere_x475guy · Mar 30, 2011

Droid X
LG 23" IPS LED monitor
Logitech Orbit AF web cam
Logitech k750 wirless keyboard
Logitech M705 wirless mouse...
Logitech G930 Headset ...
Well you asked.

Foozer · Mar 30, 2011

A Radio

And would you believe that they have phones now that need no wires? Went out and got me one of them new fangled things. In the 21st century now I is.

Robert

Robert

Deanofid · Mar 30, 2011

I have a phone that has a wire going into the wall. And a computer, of course, four years old. Got some rechargeable AA batteries a few months back.
Yes, my lathe does run on electricity!

Hilmar · Mar 30, 2011

I have three phones with wires and looking for a encabulator with Tape cassette player 19 ", not the boom box type.
Hilmar

Troutsqueezer · Mar 30, 2011

Amplifiers! I made a million of 'em when I was a young buck. Here's one of many - this is a single-ended Class A 15 watt per channel. THD is almost lower than the signal generator used for signal input. Back then it put Mark Levinson's overpriced junk to shame. ;D

bearcar1 · Mar 31, 2011

I just purchased a new B & W TV if that counts for anything. :

:big:

BC1
Jim

BlakeMcKee · Mar 31, 2011

You guy's amps put mine to shame! I've made 2 chumoys.... and I've never even bought enclosure's for them... but I was so happy when I made my first one, it was like seeing my new born son for the first time! :big:

milotrain · Mar 31, 2011

Anka, that's some really nice woodworking.

Trout, you don't happen to have a schematic lying around do you

milotrain · Apr 1, 2011

Finished this last night. Still messing around with the first gain stage tube bias.

It will get a better box later. A fair bit of AC hum from the filaments in this setup but that's to be expected with how long I left the leads. I didn't want to cut them short until I knew where things were going. It's a 12AU7 gain stage with a 6DJ8 White Cathode Follower. Running off a 110V secondary winding that's putting around 178V out the B+ after that big honking blue cap. That's why my bias is screwed up. Swapped out the electrolytics on the output to some huge 47uF Solen MPKs.

Troutsqueezer · Apr 1, 2011

Now this is going to show my age but looking at all those caps reminds me of the early days of using transistors for power amps (and other things). The engineers back then were using proven tube design theory as precedence to figure out where they should use caps to decouple, filter, stiffen, stabilize the various transistor stages. If you look at early schematics of solid state power amplifiers you can see there were capacitors all over the place, obviously artifacts from the tube era. As time marched on, we figured out we didn't need 80% of those. One or two strategically placed caps was all that was needed to prevent oscillation and provide the necessary high/low pass filtering.

milotrain · Apr 1, 2011

In my defense I'm bypassing a lot of those caps with other caps.

The Greenies are 100uF 25V Nichicon Muse Bi Polars
The Yellows are a mix of .22uF and .174uF MPKs from various manufactures.

Big blue is a 1800 uF 450V power cap. Simplified my life to go with that rather than a pile of smaller values.

Figured out the new resistor values for the bias I want to try, but I'll likely put that off until I rebox it as the cathode bias resistors are buried in there.

Troutsqueezer · Apr 1, 2011

Now here's a gadget from the early '70's that some folks might get a kick out of: Back then I was fresh out of college and was part of an engineering team that developed a new speaker system for an audio company called ESS. This particular sound system was called the AMT-1, and it propelled ESS into the international audio industry limelight for a couple of years. The tweeter in it was a brand new invention by Oskar Heil and it was the rage of the industry because of the way it worked, which was to squeeze air rather than push it, increasing the efficiency of the driver by a factor of 5.

So here we are, showing off our new product at the Consumer Electronics Show and this guy comes around offering to have his picture taken with our products for a sum of around $500. We decided to go for it.

A little younger back then, huh?

-trout

ELECTRONIC GADGETS

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