Search found 11 matches

by softbaugh
Wed Oct 26, 2016 1:35 am
Forum: Field Phone Communication Project
Topic: Field Phone Concept
Replies: 3
Views: 4740

Re: Field Phone Concept

Hi mobius,

Good question, and maybe. What kind of alarm signals are you interested in using?
by softbaugh
Sat Sep 03, 2016 4:09 pm
Forum: Field Phone Communication Project
Topic: FCC Verification Passed!
Replies: 0
Views: 2801

FCC Verification Passed!

The FCC requires devices such as the field phone to be tested against radiated (radio) emissions and conducted (into the power line) emissions standards, and this system passed the final portion of the testing yesterday, 2 Sep 2016. This version of the board will require some external filtering for ...
by softbaugh
Fri Jun 03, 2016 9:43 pm
Forum: Field Phone Communication Project
Topic: Kickstarter Funding
Replies: 1
Views: 4085

Re: Kickstarter Funding

Thanks to everyone who backed our Kickstarter project, but sadly, it missed its mark. This will result in the following changes to the project: First, the field phone project will no longer be open-source; given the limited niche interest, we are going to keep this as a proprietary product to recoup...
by softbaugh
Thu May 05, 2016 7:24 pm
Forum: Field Phone Communication Project
Topic: Battery and Resistor Alternatives
Replies: 1
Views: 3241

Re: Battery and Resistor Alternatives

Options suggested by Gatorbait3014: Ramsey Electronics manufacturers the Model # QLRD1 Viking Electronics manufactures several models. The DLE-200B supports two telephones. Viking Electronics also offers a free PDF document on the subject: https://www.vikingelectronics.com/products/appnotes/ringdown...
by softbaugh
Wed May 04, 2016 10:07 pm
Forum: Field Phone Communication Project
Topic: Kickstarter Funding
Replies: 1
Views: 4085

Kickstarter Funding

We are launching a Kickstarter campaign to raise $5000 to offset the initial production costs: https://www.kickstarter.com/projects/softbaugh/field-phone-open-source-production This campaign will allow us to more accurately gauge market interest in the field phone system. We have a choice between of...
by softbaugh
Mon May 02, 2016 12:55 am
Forum: Field Phone Communication Project
Topic: Open Source Design Tools
Replies: 0
Views: 2677

Open Source Design Tools

For this open-source project, we needed to select open source design tools so that anyone could make changes as they wish. Two design tools were needed, one for the PCB development, and another for case design (to be used later). For PCB design, we selected Kicad. Until about a year ago, our normal ...
by softbaugh
Sun May 01, 2016 4:45 pm
Forum: Field Phone Communication Project
Topic: Battery and Resistor Alternatives
Replies: 1
Views: 3241

Battery and Resistor Alternatives

A simple phone circuit can be made with a battery and a resistor. This approach is a favorite of science fair projects, but we wanted a more robust design. One problem with the battery and resistor option is picking the right resistor for the phones used (from the point of view of the resistor circu...
by softbaugh
Sun May 01, 2016 4:25 pm
Forum: Field Phone Communication Project
Topic: Weatherproof?
Replies: 0
Views: 2850

Weatherproof?

In a word, no. The field phone concept was intended to fill the gap between military-style weatherproof and rugged field phones on the one end, and the phone company on the other. The best application of the field phone system is between buildings and shelters. Since the system is designed to use or...
by softbaugh
Sun May 01, 2016 1:09 pm
Forum: Ring Interface Modules
Topic: Ring Interface Module Status: 160501
Replies: 1
Views: 3638

Ring Interface Module Status: 160501

The first ever ring interface module was prototyped on a spare v0.1 host module PCB as the circuitry is very similar, so we'll call that one v0.0. Shane has this unit as a museum piece. v0.1 is a formal distillation of v0.0 on its own PCB. This is the baseline ring interface module with RJ11 phone c...
by softbaugh
Sun May 01, 2016 1:02 pm
Forum: Field Phone Host Board
Topic: Host Module Status: 160501
Replies: 0
Views: 3135

Host Module Status: 160501

Right now the host module PCB is in its third prototype (v0.3). Here is a the history of the various prototypes so far: v0.1: Our first effort worked well as a phone host board, but had some unexpected response of the charger to the input protection circuitry. This design had an input PTC, but at lo...

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