Discussion in 'Homebrew and Kit Projects' started by W1VT, Jul 22, 2020.
the power supplies from old pulse electric fence boxes made great telegraphs as long as you didnt touch the transmit wire (you could get one heck of a belt from it)
used neon bulbs at the other end of the wire and slow morse code
ha its a wonder we didnt hurt ourselves when we were younger!
My first "build" was a 1-tube radio kit. I'm not at all sure of the brand or source, but it was a birthday present when I was 11 or 12. The tube was a 1T4, battery powered, and the receiver tuned the AM broadcast band. Much better than my old, pre-built crystal radio, fer sure!
Once I got into ham radio, I built T-R control relay systems, CW monitors and other small accessories. Since my dad also used a CB radio to dispatch his heating repair truck, I was able to tinker with his base station setup. I actually combined two CB rigs - one was a Knight-Kit C-27, which had a superb dual conversion receiver but could only put out about 2 watts at 50% modulation, the other was a Utica Town and Country, which had a terrible receiver, but put out an honest 4 watts of RF. Once I got the two of these things lashed together, I added a 25-watt AUDIO amp as a replacement modulator for the T&C. The amp ran a pair of 6L6's in P-P parallel, for vast overkill. Worked like a megabuck Demco or Browning rig.
In later years, I built an Op-amp audio filter, which I still have but no longer use. That was my most modern effort. Surface-mount components are just too much for my old eyes and hands. . .
funny thing though a pretty young lady or a nice and shiny new radio will still turn our heads a bit
i still have my old radioshack book of transistorized circuits someplace in the shack.
I agree, this is a great thread, with a lot of great projects on the bench. My project isn't an old project either, but something thats nearing completion.
This is a tunable block converter that will allow you to use ANY old Pan Adapter like the ancient Heath Ham-Scans, SB-620s or similar offerings from the KenYaCom group, with any receiver regardless of it's I.F. frequency. No modifications to any Pan Adapter or receiver is needed, aside from getting the IF signal out of the radio, and Heath covered that well, years ago.
Add your receiver's I.F. frequency and the input frequency of your pan adapter together, set that frequency on the DDS module, and you're up and running.
The Attenuator will help keep the input level to the NE-602/612, and your Pan Adapter within normal input levels. This configuration will handle input levels up to a Volt or so without the input clamping diodes. The output buffer will drive a 50 Ohm load to about +3 dBm, far more signal than any Pan Adapter needs. I set mine up to accommodate 4 receiver inputs, hence the row of four extra relays and extra connectors along the left edge.
CHIP-TOCK Project by Alex F. Burr (Dallas, TX)
Elementary Electronics magazine, July/August 1976 issue, Page 45
Used the popular National Electronics “MM” series of Clock Chips and
Fairchild FND-70 common cathode 7-segment LEDs for Display.
PC Board was a slight rework of the OptoElectronics Clock Kit, introduced in 1975.
Debo Electronics in Ohio eventually bought the Rights to the OptoElectronics Clock Kit.
National MM5314N, 24-pin (data sheet, attached)
For the past 25 years,
Jack at ElectronicsUSA sold digital clock kits based on the National Clock Chips.
Electronics USA MM5314N clock kit
Electronics USA still sells this discontinued National Clock Chip, now $20.00 each.
This is a fun thread.
Here are two versions of the Tuna Tin Two that were built by my buddy Mat (WB0WLE, now SK) and
me while in Jr. High School. We had QSOs with them between our houses, which were about a mile away.
These were far from our first projects, but a lot of fun. Kudos to the QST authors for figuring out how to turn
a Radio Shack choke into RF coils. We also built the matching receiver, which never worked as well. Does anyone
remember the name of the receiver?
The oldest project I remember doing was around age 5-7 when I strung whatever pieces of wire (and even coat hangers) in series and managed
to remotely light up a bulb on one end with a battery on the other end. Primitive telegraph device.
There seems to be a sub-thread about things that go "click", here are two versions of clothes pin match guns that would concern
most adults, you could cock the spring and stick a strike-anywhere match head into the opening. When fired, it would send a flaming projectile
up to 20' or so. Great fun for a Jr. High School student ;-)
You could call the miniature version a "sawed-off match gun".
Wasn't the receiver called the "Herring Aid" ?
I remember the match guns, hadn't seen one
in nearly 60 years!
Yes, that was it. I built a miniature version of the Herring Aid to match my Tuna Tin Two, but I don't think I ever made it work due
to a lack of space in the can. Another project for the bucket list.
Google found a newer version (2014) of the Herring Aid by the NORCAL guys,
it can be built with parts that are available today:
My first radio was a galena receiver and the second a regenerative 2 tubes one (3S4, 1T4) powered by 2 batteries. Its parts were put in a box and stored in an attic for more than 50 years ago.
If you are interested in its story have a look at my Web page :
73 de Roland F2DC