looking for a phone ringer ic - mc34017-1p or 34017-1p

[dacflyer]

i have a old "phone flasher" from radio shack.
it is the one that has the ringer and strobe light all in one.
it got zapped by lightning.
the ringer ic in it got hit.
does anyone have one laying around or know where i could find one ?
i already checked with mouser and digikey. they do not have a list for it.

[Janitor Tzap]

Here's a place Dacflyer.....
http://parts.nowcomponents.com/parts/MC340171P

I found several other places, but they seem to be in the Asian markets.


Signed: Janitor Tzap

[dacflyer]

i made a inquiry about the chip,,no response...Grrr

[Janitor Tzap]

Okay,

Have you tried these peoples?
IC Digital Electronics Inc.
http://search.icdigitalelectronics.com/ ... it1=Search

It shows they have quite a few.


Signed: Janitor Tzap

[dacflyer]

i think i do not get any replies, because i am only wanting 2 pcs of this part, these people are wanting to get rid of these by the thousands..lol
i might just give up on this phone flasher...

[Janitor Tzap]

Hmmm...........

Have you tried these people?
http://www.aeri.com/pn/motorola-semicon ... mc340171p/

Well.....
I looked and priced some "Phone Flasher's" and they are running $20 to $30 dollars new.

Another option.....
Find a Phone Flasher circuit that you can build from discrete components,
to replace the old burned up one.
Like this circuit.
http://www.circuitstoday.com/ringing-ph ... ht-flasher


Signed: Janitor Tzap

[haklesup]

if your phone flasher is for a person with hearing disabilities, many phone companies will give you one for free. Call the service number (611?) and ask about their policies for disabled customers. If the phone flasher is just for your personal convenience, then you are on your own.

Maybe you want to design a new one from scratch using non obsolete components, I'm sure we'd like to help on that project. Seems that all you need is a Cap to send the ring signal to a comparator then that can convert it to a digital signal that you can direct to a flasher circuit of a variety of designs.

Have you reverse engineered the circuit you are working on, perhaps with minor modification a different IC or circuit can be substituted

[dacflyer]

the phone flasher is the one they used to sell at radio shack..
it had a ringer and a strobe light.


as far reverse engineering. i am not able to do that. as far as i could see, the ringer is taking in the ringer, and converting it to a direct drive to the ringer, and then part of that signal triggers the strobe.

there used to be a non-strobe phone flasher.. it was very simple.. if i remember it had a cap and full wave bridge that closed a relay.. i tried to duplicate it. but i never could find the right cap..the one i saw in the circuit, but it was unmarked. and the relay was listed as 75V and high Ohm coil.
the circuit was self driven all from the phone line.. and the 120 side was strictly for driving a lamp.

i was trying to fix this for a elderly friend, that's becoming hard of hearing.

[Janitor Tzap]

Does it have too be run by the phone line?

Because here's a circuit I found that you can modify, too do the job.

The contact less telephone ringer circuit can produce a ring as well as a visual indication when a call comes.The main advantage is that since there is no direct contact between the phone line and the circuit there is no chance for a loading or disturbance in the telephone line.

When the telephone rings 60 Hz AC signal is generated which produces a proportional magnetic field around the telephone lines.These magnetic field will be picked up by the coil L1 due to electromagnetic induction.A proportional voltage is developed across L1 and it will bias transistor Q1 to ON.This results in the conduction of transistors Q2,Q3 andQ4.The buzzer will ring and the LED will glow.The switch S1 acts as an ON/OFF switch.

Notes.

* For L1 make 50 close turns of 28 SWG enameled copper wire on any of the two telephone wires.Connect one end of the coil to base of Q1 and leave other end free.
* If the circuit not works by try by changing the end of the L1 connected to base of Q1.
* A 9V transistor radio battery can be used as the power source.
* Assemble the circuit on a good quality PCB or common board.
* Use of this type or any other devices other than the allowed telephones and devices with the telephone line may be a law violation in some nations.Check it properly before trying.

Hope that helps you.


Signed: Janitor Tzap

[dacflyer]

the flasher was all self powered ( ringer ) except for the strobe, it was line powered..
if i can repair it, fine.. but i do not want to modify it.
if it cannot be fixed, then i need to find something else...

if i could find a self powered unit that just closes a relay, that would work as well... plug a lamp into it.
i was thinking a cap, full bridge and a relay, but i do not know the cap value to where i can energize the coil and stay within the ringer EQ.

[Janitor Tzap]

Okay,

Well,
here is a unit by Krown that uses only the phone line too power it.
http://www.jr.com/krown/pe/KRN_PF200/

That should work out for him.
You can put the old one aside till you can get the parts to fix it.

EDIT: Came across this on ebay.
http://www.ebay.com/itm/34017-3P-Manu-M ... 4897.l4276


Signed: Janitor Tzap

[Robert Reed]

Not sure of the light intensity you require. when I worked in R&D, all the engineering offices surronded the main lab floor and had large windows facing the floor. At that time we simply wired a large base neon glow bulb across the phone line and then a skinny two conductor concealed lead to the office window. Now when we were on the floor we could very easily "see" a call coming in with that flashing light in our particular office window. I have not kept up with phone advancements in recent years, so i'm not sure of what the ringing voltage is in effect today, but if it is still high like it was this idea would work. If memory serves me correct the bulbs were GE NE-16 and GE-7AA, but any of a dozen others in that class would work OK. the bulbs draw i.5 - 2.0 ma and fire at 60-80 volts. Resistors-15-30K (guessing).

[dacflyer]

the neon type bulbs are not very bright at all.. i am needing an attention getter like the strobe did.

i could settle with a unit that drives a relay. then i could just connect a table lamp to it
radio shack used to sell one.. the phone line drove the relay, and the relay controlled the lamp.
the relay stayed closed as long as the line was ringing..not flickering.


thanks for the info on the chip....but i seen the part comes from hong kong..and there is a note that their warehouse had a explosion..how tragic...lol
i sent them a email.. see what they say..

[Lenp]

Years ago the telephone company used a sensitive relay in series with a capacitor accross the telephone line (ringing is typically 90v 20hz) There are ringer relays available , from Mikesandman.com, as we'll as others. Maybe a mechanical ringer, a cap from an old phone and creative placement of a switch would make a DIY ringer relay!

[dacflyer]

the one i had seen before had a 75V relay.. i tried various caps and lower voltage relays, but no luck.
even high ohm relays.. phone lines are soooo tricky..lol