Archive for the ‘Uncategorized’ Category:

2019-04-13 Olympus Digital Player Has Flutter

from FB group Vintage Electronics Test Equipment For… Apr 13 I see a Leader wow and flutter meter for sale. This reminded me of a problem I’m having with my Olympus digital recorder/player (WS-822, IIRC). I’m listening to it playing and it’s sounding like there is flutter in the music! That seems crazy to me,

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2019-04-12 Crazy Dangerous Invention

Bill Sherman I’m assuming you have to bend way over to use the machete. Weed whacker has a handle that takes care of that problem. When I was a kid, a neighbor was a real dangerous inventor. This was long before weed whackers. He took the impeller and shroud off a Hoover vacuum, leaving the

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2019-04-11 Northeastern Telephone Test Set TTS-4A

from FB group Bell Telephone of… Apr 11 I got the Northeast Electronics telephone test set TTS-4ANH and the first thing I did was open it up and remove the batteries. OMG! I took out 3 D cell and TEN of the cylindrical 9V batteries! At ten dollars per 9V battery, it will cost me

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2019-04-08 Output Transformers Construction

from FB group Regenerative Receiver… Apr 8 庄议翔 The power transformers have the laminations interleaved. The first lamination has an E then I, the next one has I then E. So the transformer core does not have any air gaps, because it does not have any DC flowing through the windings. The transformers for single

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2019-04-06 HP Transmission Test Set

from FB group Bell Telephone of… Apr 6 (I bought a transmission test set, TTS-4, photo at bottom.) Glenn Peters We had a HP 493something transmission test set for testing up to 56 kb/s lines. I remember seeing the symbols on the green screen, like a carriage return would look like a little ‘CR’. The

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2019-03-27

From FB group transistor radios Mar 29 Lin Holcomb One never knows what secrets the US government has hidden. They could have some other plans for using the WWV stations. Decades ago I worked for a radio engineer, and we had a frequency counter traceable to NBS (now NIST). He noticed that the frequency of

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2019-03-19 Radio Alignment Questions

From FB group Building Transistor Radios Mar 20 Bob Kirsch Any recommendation for doing a complete alignment? Documents? I used a HP sweep gen decades ago but I don’t have one now, just an old signal gen. I thought about building a sweep gen but I need to get a few parts. I have bought

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2019-03-17

From FB group Building Transistor Radios 2019-03-19 John Ferguson Yeah, I used to use the Sylvania ECG and the NTE catalogs to cross-reference transistors. But then I got some better product manuals from the makers, especially Motorola and National Semi. And I got hold of the professional industry documents. ECG and NTE give a ‘one

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2019-03-13 Regen Receiver Schematic

from FB group Building Transistor Radios post by Tuck Choy. I sharpened and lightened it to make it more readable. From EPE Mag. Sep 2005 by Thomas Scarborough. Since only four of the 6 inverters of the CD4069 are used, the CD4001 or CD4011 quadruple NOR or NAND gates should substitute, if the other unused

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2019-03-12 Dipper, Wavemeter, Receiver Added Pt. 2

Update 2019 Mar 12 – I continued to add capacitors and variable resistors along with switches to change them similar to the VK2ZAY video on YouTube. By switching the capacitor and trimmer resistor, it can now act as a receiver. I clipped a 2 meter long piece of wire to the tuning capacitor and with

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