Archive for the ‘Uncategorized’ Category:

2017-11-10 Built Phase Shift Oscillator From YouTube 

I watched the YouTube video of Radiofun232 testing the PSO that he built according to the schematic he showed.  I modified it somewhat.  My objective was to decrease the frequency down to 400 Hz. I used three 0.1 uF capacitors and a 0.56 uF instead of the 0.47 uF.  Instead of 1k I used 2.2k.  I replaced the

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2017-11-08 Using More Than 2 Phones As Intercoms

From FB group Bell Telephone… While I see a discussion about connecting phones in a party line, I’d like some input on this.  It’s easy to connect two phones because they can be connected in series, and both phones have to be off hook.  But more than two phones, they can’t be connected in series

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2017-11-03 SAC Caused the Telco CO To Go Into Alarm! 

From FB group Bell Telephone… Our Pac Bell account representative would meet with us typically monthly.  We had an IVR system with 36 lines for registering for classes.  We printed the students’ registration mail with one date and time for the opening day, usually a Monday at 10 AM.  Well, our account rep and another

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2017-11-02 Dummy Batteries To Hold Power Supply Leads

I made up these dummy batteries to hold the power supply leads in the battery holder.  I used alligator clips, but they pop off, and they can’t be used when the case is on. I cut off short lengths of wood dowel, and drilled holes for the screw and for the wire to pass through.

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2017-10-29 Esther Had No Fingerprints 

From FB group Bell Telephone… Speaking of federal contracts…  I had a neighbor, Esther, who was 96, and she told me about her husband’s company, Glaser engineering.  During WW 2, they were bidding on some government contract, so they had to be investigated by the FBI.  They had to have their fingerprints taken.  A few

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2017-10-28 Old Telephone As Arduino Number Input

The old dial telephone uses pulses of current to dial phone numbers.  I thought it might be useful to enter digits into an Arduino.  I have to investigate if there is already a program that can do this. The phone has to have some current, maybe 10 mA, flowing through it so that the pulses

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2017-10-27 Telephone To Desk Light

From FB reply to video of a European gutting a 500 style phone to make a desk light: ​The ‘giant’ (mini) toggle switch wasn’t the pain;  it was the hole drilled right through the dial that made me cringe.  I would’ve used an invention I made for a project I built.  I put the switch

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2017-10-26 AT&T And Carterfone Decision 

From FB group Bell Telephone… Ars Technica article link at the end. Me: You’re right, Ed.  I’m also on another old timer’s group and someone brought up the days we were coming in from gym class in high school, and we had a hard time breathing because of the smog here in the LA basin.

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2017-10-25 Cisco VoIP Errors, Fax Jitter

From FB group Bell Telephone… Oct 28 Pat Chicas We (at where I worked) used all Cisco 7900 sets.  You can tap the help “?” button twice during a call and see the statistics for the call, both for a time (per second?) and cumulative.  I would go to one bldg and make a call,

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2017-10-24 AT&T And The Breakup

From FB group Bell Telephone…  Oct 29, 30 to Ronald Cooper Yeah, Touchtone is an excellent example of AT&T’s holding back technology.  Besides the customer paying them for a service that benefitted AT&T more, making the customer pay so much ($1.20 a month, when my phone bill was $10 to $15 a month), they gave

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