Introduction: Private Phone Line for Under $10

I will teach you how to make a private phone line with two non-cordless phones with stuff you can find mostly around your house! Great for kids and there clubhouses!

Follow my instructable and/or just watch this step by step video


If you like my instrucables PLEASE visit my Metacafe channel and watch the videos and give them 5 stars and or digg them.

Thank you so much enjoy,
Flippi273

Step 1: What You Need

The items that you need are:

2 phones (dont use cordless, well you can if you want...)
2 phone cords
4 alligator clip leads
1 300 ohm 1/2 W resistor
1 9V battery
2 phone jacks

Step 2: Connect Your Phones to Wires and Jacks

Okay first thing we do is connect our phone cords to our phones.
Then we connect the other ends of the cords to our phone jacks.

Step 3: First Alligator Clip

Now take one of your alligator clips and clip it to the red wire (metal part of it) on the back of one of your phone jacks.

This part can mess up if your phones work so make sure the alligator clip is on right.

Then take the other end and clip it to any end of the 9V battery.

Step 4: Second and Third Alligator Clip

Now we take another alligator clip and clip it to the other side of the 9V battery.
Take the other side and clip it to one side of the ohm resistor.

Take your third alligator clip and clip it to the other side of the ohm resistor.
Like before now we take the other end of this alligator clip and clip it to the red wire on the other phone jack.

Step 5: Last Alligator Clip

Finally we grab our last alligator clip and clip one side onto the green wire on one phone jack and the other side onto the green wire on the other phone jack.

Step 6: Talk Away!

Now make sure all connections are secure and your phones will work! You can now communicate between both phones

They will work for as long as your wires are so you can span them across your house, or even to a neighbors!

Like I said before you can choose to solder your wires for a more secure connection too.

Hope you all have phun with your own private phone lines!

(Stay tuned for the next instructable which will teach you how to make them ring, this is a bit costly though =/ )

If you like my instrucables PLEASE visit my Metacafe channel and watch the videos and give them 5 stars and/or digg them.

Thank you so much enjoy,
Flippi273

Comments

author
agnestre made it! (author)2011-09-14

Is 270 ohm 2w OK?

author
Wasagi made it! (author)2010-07-17

This is excellent!! I was thinking of rigging up the local storm drains with something like this, and maybe even use some doorbells as ringing devices... hmmmm

author
Mavamaarten made it! (author)2009-04-24

Nice, but kinda stupid to talk like this. a LONG cable running from phone to phone ? NO thank you. nice instructable tho

author
danielemur made it! (author)danielemur2009-11-12

You can use two cordless phones.

author
wombat99 made it! (author)wombat992009-08-20

Well, it's not something for everybody, but (IMHO) it's a nice idea if you have small kids. This is the kind of thing that if I put one in my son's playhouse and one somewhere else he'd use it on playdates ("Hey Jimmy, you better to get the base -- there's a secret message coming in!"). A non-DYI solution (which includes ring) would be a "ring down" box (or line simulator, line tester, etc). Viking makes one. These can be expensive brand new, but can be found at ham fests, eBay, etc from time to time. But I'm not trying to take away from this Instructable -- good job, Flippi273!

author
danielemur made it! (author)2009-11-12

If you didn't have the resistor than what voltage would you supply?

author
condoritos123 made it! (author)2009-08-12

thank you, I don't know so much english, but i needed this... i'll try it in my house

author
Ezza made it! (author)2007-11-22

This is a really sweet idea. Can you make the phones ring or do you just pick them up to talk?

author
Flippi273 made it! (author)Flippi2732007-11-22

I actually do know how to make them ring, but you need extra hardware which cost some money, so once i get some money get all the stuff ( im a poor teenager haha!) ill show you guys! but right now u just pic them up and talk

author
psptubefreak made it! (author)psptubefreak2009-07-23

lol im poor aswell...although,im 14 and have a job...lol

author
psptubefreak made it! (author)psptubefreak2009-07-23

oh and also,it would be easier to hook up two LED's to switches and a power source,so if you wan someone to pick up,flip the switch to tell the other person to pick up

author
perlpower made it! (author)perlpower2007-11-23

To make the phone ring you would want about 90V @ ~40Hz AC sent across the line and you would need to remove the 9v battery as you send it.

author
luigi2999 made it! (author)luigi29992009-01-29

no, all u would need is a diode to prevent flow to the + terminal of the battery

author
lopez8675 made it! (author)2008-07-03

couldn you just use a corless phone, have someone have the base, other people use all the handsets and use intercom?

author
extremegtafan made it! (author)extremegtafan2008-07-29

Some of us can't afford fancy multi-handset intercom phones.

author
lopez8675 made it! (author)lopez86752008-08-02

how much do u think they cost? i saw one at bennys for like 20-30 dollars.

author
ReCreate made it! (author)ReCreate2009-03-18

oh,wow that's cheap i probably will buy that tomorrow ill see if it works

author
luck made it! (author)2008-05-29

if i use a cordless phone will it run the 9volt dead quicker than with a wired phone

author
ReCreate made it! (author)ReCreate2009-03-14

no,not at all just connect the base to power

author
luck made it! (author)2008-07-30

What would happen if u dont use a resister

author
ReCreate made it! (author)ReCreate2009-03-14

the phones would both blow up and catch on fire

author
agis68 made it! (author)2009-02-23

Very good the idea is very old but nice work. Back to 50's-60'sand 70's in big offices when the electronic telephone lines doesn't exist the unique way for interior communication was that way. So everybody had his own telephone device and they could communicate each other. Here in Greece was very popular and in the years of Dictatorship some guys trapped these telephones to record the chats and these machines had the nickname: Gossip, or Rat or Bug

author
heartlessangel7 made it! (author)2008-11-07

Ooohhh, I want this for my secret base.

author
Derin made it! (author)2008-10-17

ill try one day...

author
munchman made it! (author)2008-09-14

I am going to do this. Also, a tip: for those that want to use this for an indefinite time, wire in a 9V DC adapter instead of the battery.

author
Inovative Invintor Joe made it! (author)2007-11-29

have you come up with a switchbox for multiple phones... if you had for instence 8 phones and you wanted a switchbox is there a way to have it so that you could assign each phone a number and then you can press the number on one phone and it be connected to that number pressed?

author
][dan][ made it! (author)][dan][2008-06-30

http://wandel.ca/homepage/pbx.html
this guy did it, though not the simplest of designs. could replace a lot of the discrete logic with a microcontroller or an FPGA

author
Flippi273 made it! (author)Flippi2732007-12-01

I believe it could be done because i do know how to make the phones ring, but you need a bridge which i cant get my hands on right now cause its expensive haha, but when i do i will show how to make the phones ring and look into making it so you can dial a number.

author
Jakeg made it! (author)Jakeg2008-06-10

plz plz make one that rings. PM me when you do!

author
Gamernotnerd made it! (author)Gamernotnerd2008-03-31

you need 90vAC~20Hz for ring

author
luck made it! (author)2008-05-29

do u apsolutly need the 300 ohm 1/2 w resister or will it fry the phones if u don't use it

author
Braeburn made it! (author)2008-05-04

to the thrift store next door!!!!!!

author
dean-101 made it! (author)2008-03-23

you could also add a buzzer to each phone an a switch so u can ring the other person

author
Gjdj3 made it! (author)2008-02-02

cool. *favorite* *+1*

author
huang.wencong made it! (author)2008-01-02

Cool! I like it! I installed one too!!! Can I use it for multiple phones (like conference)?

author

yes this will work fine with multiple phones, just wire the extra ones in parallel.

author
infotransfer made it! (author)2007-11-28

what would happen if you did it without the resistor?

author
Flippi273 made it! (author)Flippi2732007-11-29

Well the phones require 8.5V and with the resistor that makes the voltage 8.5. So without it it would be giving it .5 more volts than it needs. So basically what happens when you give something too much electricity ;)

author
infotransfer made it! (author)infotransfer2007-11-29

thanks!

author
rc jedi made it! (author)2007-11-23

cool, we do use this system at wk. we glear wire pairs by clipping on 1 good known pr and talk between testers in just that way. Well, i usually just use the cell now, if the work is just for a couple of minutes! talk current is low, about 20 ma i think. idle battery voltage is 48v but drops quite low when connection is established. 9v is good enough.

author
sonnimo123 made it! (author)2007-11-23

awsome!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

author
GorillazMiko made it! (author)2007-11-23

sweet like chocolate. errr i mean... awesome instructable.

author
!Andrew_Modder! made it! (author)2007-11-23

oh w8 is this like a...what do you call it.. So basicly it just lets you talk to ppl inside your house?

author
Flippi273 made it! (author)Flippi2732007-11-23

Well you could have it hook one phone up in a club house, and then one to your house. Could put one up stairs and the other downstairs. This is mostly designed for kids haha

author
!Andrew_Modder! made it! (author)!Andrew_Modder!2007-11-23

ya ok. lol when i was younger i would have LOVED this, but now its so so :-P but for younger kids, they would love this!

author
futeng made it! (author)2007-11-22

do you know how you can do this without wires?

author
Flippi273 made it! (author)Flippi2732007-11-22

You mean like using a cordless phone correct? all you have to do is the same thing except plug your cordless phone base into the wall ;-)

author
gamer made it! (author)2007-11-22

when i was smaller i made one with the same disign except 1. it plugged into a wall transformar instead of a battery, and 2. i used a coil to absorb the waves so they dont ge and charge the battery, cause i would get a bad sound. then i put long wires on it, and put a phone in my room, and one in my brothers, and it work really good. nice insructable -gamer

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