Hi there and congratulations on the great site which has got me really motivated to build a set after at least 40 years!!!
I am going to start with your 'Spider Web Coil Receiver' and so that I can experiment with different diodes (either alternatives of the same model or a different model) I decided to build a diode holder in which the diode can be changed at will without the need for de-soldering. Picture attached.
It's rather crudely made but I did it in the style and spirit of a cat's whisker of the early days. I used two brass pins from a British mains plug which have wire tightening bolts at the top.
!!!
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Hi Bernie, it's not crude like my very early sets build of luster terminals. It looks like very radio-technical equipment. Idea: if you turn the pins 90 degrees you must not bend the wires every time for change of components. Or fitting your diodes complete through the clamps from the side (with housing)??
lots of greetings Björn
Es strahlen die Sender Bild, Ton und Wort elektromagnetisch an jeden Ort -Kraftwerk-
I hadn't thought of rotating the pins 90 degrees...that's a good idea.
I did it this way so that I didn't have to bend the wire leads as I have a stock of diodes that I may want to resell!!!!!
In fact I will do another version, possibly using red/black terminal posts, but this time put the diode/connectors UNDER the clear cover which would then better simulate a cats whisker!!
Hi Bernie, I haven't give enough thought... Of course, threading without bending, from the inside to the outside, should be able by moving the diode left and right, and if the second wire not to long. ok...
When the project is completed, feel free to post it here.
lots of greetings Björn
PS: Speaker clamps are stylistic inconsistency
Es strahlen die Sender Bild, Ton und Wort elektromagnetisch an jeden Ort -Kraftwerk-
Well I wasn't that right...as you forsaw I have put the 2 connectors too close together and in order to get a new diode in I have had to bend the leads anyway....or I could cut them.
An old OA70 fron the sixties with cut leads fits perfectly!!
Yes I will post the finished set when it's done......I'm still waiting on one or two components from *(W)* sellers although I do have a number of old/recycled variable capacitors!
Well I have now finished my version of the 'Spider Web Coil Receiver'
It is mostly of parts from my scrap box. I have attached some pictures.
1: I used the diode holder and the OA81 referred to earlier. 2: I made my coil a plug-in one so that if I have to change it or want to experiment it'll be very easy. In the photo you will see the red alligator clip/lead that attches to the tap. 3. The coil former is a pair of plastic disks salvaged from a pack of CD's from LIDL! I used ordinary 24SWG enamelled copper as I dont have any Litz and was too mean to buy any! I used holt melt glue to secure all the windings. Time will tell if this is a good idea! 4. So I can experiment with different resisitor values I put a choc-block connector across the phone socket. 5. I used Gold/brass banana plug/heavy duty speaker adaptors for the Antenna and Earth connectors. These, like the main tuning capacitor, are mounted on platforms of clear acrylic made up with hot-melt glue. I get off-cut sheets from my locsl picture framer often for free!
I use the earth installed for my radio shack and an antenna has got to be put up. In the meantime I am using a MW DX external tuner I made from a magazine circuit more than 20 years ago. This feeds the signal through a ferrite 'probe' which seems to work quite well inside the antenna coil tube! Unfortunaely I no longer can find the circuit for this device . The primary and secondary coils are wound on a short section of plastic pipe.
This project has taken me back more than 40 years and was very stimulating. Thanks to this site and the suggestions/ideas here I will be attempting some more designs. Also I intend to make a BFO for LSB/USB reception...see the Youtube video I posted earlier.
Hi Bernie, Well done! And damn quickly - for a lifetime project. Your Speaker Terminals are properly right. I feared that, you mean those ugly red-black plastic spring clips.
I am itching to to get up immediately and make something similar.
73' Björn
Es strahlen die Sender Bild, Ton und Wort elektromagnetisch an jeden Ort -Kraftwerk-
Well actually, when I wrote that mail I DID have those uglty plastic terminals in mind. However I have just had an an even better idea for the next diode holder : Wink! (as you would say)
Anmelden
ok...
