"The phone is a remarkably complex, simple device, and very rarely ever needs repairs, once you fix them." - Dan/Panther
Started by TelePlay, June 27, 2016, 09:37:29 PM
Quote from: HarrySmith on October 06, 2016, 11:46:03 AMVery creative, nice work!
Quote from: Pourme on October 07, 2016, 06:40:30 AMWorkin on phones at 4am....It is looking good, John.
Quote from: TelePlay on October 10, 2016, 07:45:38 PMQuick question.When dialing out on the stick with the receiver to my ear, I get a lot of mechanical feedback from the dial working on the metal base attached to the metal stick attached to the metal cut attached to the metal transmitter.Was there a rubber gasket between the dial and the base or is that just the way it's supposed to sound, or sounder 95 years ago?
Quote from: unbeldi on October 15, 2016, 09:38:14 PMHmm, 500 ohm total resistance for a bridging ringer is rather low. But it is rather high for a series-ringing circuit, most of those ringers are only 100 ohms or lower.I wonder what the A.C. current is without ringing capacitor, i.e. directly connected to your DSine generator. If you can measure that, measure also the voltage across the ringer. That gives us an idea of the impedance of the ringer, which will be higher than the D.C. resistance, which is 500 ohms.With a 3-4 µF capacity, I would guess that ringer to have at least REN 5.A 0.47 µF capacitor is indeed probably too small for a low impedance ringer like this. My guess would have been between 1 and 2 µF for a good value.Hmm, is this ringer in any of the AE catalogs ?
Quote from: TelePlay on October 16, 2016, 03:22:55 AMLearned something about the 616 tonight. It will not send ring voltage down a line unless it sees more than 0.47 uF capacitance on the line, however it does that.Once I raised the ringer capacitance over 1 uF, both my ring generator and 616 activated the ringer.----------------------As for measurements, the Dsine ring generator produced about 20 VAC measured at L1 and L2 and about 22 VAC across the ringer terminals.With a 2.063 uF capacitor in place both the ring generator and the 616 rang the bell nicely. The ring generator produced about 22 VAC at L1 and L1 and the 616 produced 32 VAC at those terminals.The old AE cap I have measures 1.568 uF and when used alone produced a weak ring. Adding a 047 uF cap in parallel gave a nice ring with both ringing devices. So, 2.038 uF was a good ringing capacitance. Increasing the capacitance did not make the ringer work noticeably better.Now, checking the AE catalog from 1905, the first catalog in which I found a ringer that looks like mine and then based on the resistance of my ringer, it appears I have a frequency ringer. I did not see any part numbers on the ringer (the label was well worn) so I went with a picture comparison.My coil resistance is 502.5 ohms which is half way between the 33.3/42 Hz ringers at 528 ohms and the 50/54 Hz ringers at 476 ohms. This ringer was found in the AECO 1934 catalog. First image below is the part numbers and the second is the image from the part number page next to my ringer, taken with and without flash. Since my ringer worked with my Dsine 20 Hz ring generator from the start, I always assumed it was a SL ringer. That reed and no bias would prove me wrong on that assumption.The above stated info was take from page 38 of the TCI document: AECO Catalog 4055 - June 1934 ocr Tl on their site. The page states this ringer was for their compact ringer box and the box I have is indeed compact.So, it rings best at 20 Hz with a 2 uF capacitor in series. The calculation of VAC, Hz, uF and ohms is beyond me. So, just put in a 2.2 uF cap and call it a project?Any other way of doing this without modifying the ringer itself?