Archive for June, 2019:

2019-06-30 Cellphones Will Take Over PCs

from FB group Bell Telephone of.. June 30 GeOrge Christensen There are only a few issues standing between the cellphones being equal to the PCs. If the touch keyboard was as comprehensive as a PC, that would help a lot. But the biggest obstacle is getting app developers to port apps to Android. Once cell

(Read More…)

2019-06-21 Telephone Ring Interception

from FB group Bell Telephone… June 21 Travis Russell I connected a neon lamp – just the lamp with no resistor or no capacitor – across the incoming line. The 90VAC ringer current causes the neon lamp to conduct, but as soon as it conducts, the Lamp conducts DC and the CO senses it as

(Read More…)

2019-06-20

June 20 Olek Kopyto What is the reason for using higher L and lower C? For parallel resonant circuits, it’s better to use high C and low L, for series resonant it’s the other way around. Higher C means the stray capacitances of the temperature sensitive components such as the transistors have less influence on

(Read More…)

2019-06-19 Vista Panorama and Santa Ana College

from FB group You… Orange June 19 Kimmie Sue I worked for a decade for a family that lived up on Vista Panorama (they moved there summer of ’64), and I lived up there for 6 months. I took photos of that area, and I climbed up the antenna pole at the top of the

(Read More…)

2019-06-14 300 And 500 Telephone Set Networks

From FB group Bell Telephone … June 17 Dan Bottoms I’ve opened up the network of a 500 set, and got my hands full of that bazillion centistokes (like tar!!) clear silicone snot that is inside. I think it finally ran off after leaving it out in the hot sun for a week. I knew

(Read More…)

2019-06-12 Plug-in Coils Pros And Cons

from FB group Regenerative Radio… Jun 13 I’ve thought about using plug-in coils, but I’ve had experience with Grid dip meters and there are a few important issues that must be dealt with. One is, what happens to the unused coils when the equipment is not in use. They get separated from the equipment and

(Read More…)

2019-06-11 Selenium Rectifier Burned Up, How To Replace

from FB group Vintage Transistor Radios Jun 12 Bob Kirsch has the right idea, but the single replacement diode *must* be rated for 400 V peak inverse voltage or more. A 1N4007 is cheap and readily available. I assume you’re in a country where the AC line voltage is 120 VAC, because the rectified DC

(Read More…)

2019-06-09 Strange 3 Conductor Crossconnect Wire

from FB group Bell Telephone… Jun 11 I’ve seen this 3 wire crossconnect wire, but I can’t remember where. Long ago we had racks of datacomm with a patch panel with patch cords. We used 3 wires of four wire IW, one wire for common, one for transmit and one for receive. These were for

(Read More…)

2019-06-07

from FB group Regenerative Receiver… Jun 13 Cyril Hodson It seems to me that these plug-in coil forms would be easy to make with a 3D printer. They would be made of thermoplastic so I don’t know if there would be problems with soldering pins or with being close to tubes/valves. Your idea of using

(Read More…)

2019-06-06 1/2 Price Offer For Lot Of NOS Capacitors

Posted to FB group Building Transistor Radios Jun 15 Months ago I started watching an eBay item of a lot of twenty Hammarlund 3 to 15 pF air variable silver plated ceramic trimmer capacitors. They were made in 1956, NOS / NIB, sealed in their original packaging and individually boxed. For months the seller wanted

(Read More…)

© RustyBolt.Info/wordpress
CyberChimps