[Chrome Electroplating]

Hi, i need articles about processes of electroplating specially for chrome electroplating, and articles about specifications of power supply for electroplating.

Thanks.

[Telephone Ring Circuit]

I think i know how to figure it out, i'll try it.

Thanks.

[Telephone Ring Circuit]

:-\ sorry don't know how... :(

[Telephone Ring Circuit]

Yes it is aloud noise produce by telephone set, i reduce the voltage level to 40 volt and it work.

How to place double-throw switch in the circuit ? and how to detect if the telephone's handset on the other side was picked-up ?

Regards.

[Telephone Ring Circuit]

Hi audioguru,

Well, i am trying to understand how general system of PBX working, but first i need to understand the basic circuit/connection between two telephones, i found two simple circuits on the internet of how to make an intercom (as you said) of two telephones or connect two telephones to communicate each other (like on the pictures below).

I have made an experiment, i connected TIP and RING line of telephone unit to 60VAC (50Hz), and the telephone was ringing.

My problem is i don't know how to connect or to couple ring circuit to one or both of these two circuits.

Can you guide me ?

Best Regards.

[LCD Monitor training document!]

Hi Shahriar,

Do you have walktrough to interface microcontrolers with CRT ? Can you share with us ?

Best Regards.

[Telephone Ring Circuit]

Hi audioguru,

On line telephone with two wires,  TIP and RING.

I have found 2 type of circuits to make simple telephone network with two telephones and with no ringing circuit.

1. One type of circuit is to connect TIP line on one side to the other side of line directly, and cut the RING line and connected in series with 300 ohm and 9volt battery.

2. The second type of circuit is to connect both TIP and RING in paralel with two resistor 300 ohm and connected the end of both of resistor with + and - pole of 9volt battery.

My question is how to modify these two type of circuits so that one telephone side can ring when telephone on the other side made a phone call ?

[Telephone Ring Circuit]

Hi audioguru,

How to make the telephone on the other side ringing ?  how to detect if the phone hook on the other side is picking-up and disconnect the ring circuit to not interfere with the line ?

Best Regards.

[Datasheet Request]

Hi, i need datasheet for IC

+--------------------+
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[Telephone Ring Circuit]

Hi, i want to understand how telephone ring circuit work and how it is connected to line (virtual telephone like PBX, not connected to PSTN).

[Speed Relay]

Here is additional information..

[Speed Relay]

I still can't figure out what the name of the company which has the logo.

[Speed Relay]

Thanks a lot, i don't know exactly which company having this logo.

Do you think they had changed their company logo to a new one ?

Regards.

[Speed Relay]

What company name which hast that logo ?

[Speed Relay]

Here is the company logo.

[Request Datasheet]

Thanks again. :)

[Request Datasheet]

Hi, i need datasheet for IC

++++++++
|  4151D  |
)  JRC        |
|  6004    |
++++++++

Regards.

[Speed Relay]

Hi, i need wire diagram for speed relay KRI001-PI.

Regards.

[Optocoupler datasheet]

Thanks hotwaterwizards, like always :D

[Optocoupler datasheet]

Hi, i need optocoupler PC515 datasheet.

Regards.

[Could somone tell me what this is?]

Maybe it is an electromagnetic induction model or transformator model. I am not sure.

[AC Voltage Regulator]

Need articles about ac voltage regulator with feedback control. Thanks :)

[Help identify unknown component]

Thanks All.

[Help identify unknown component]

Hi all, i still don't understand how SBS works..can you explain to me the characteristic of SBS ?

[Help identify unknown component]

So this device is a SBS semiconductor ? Thanks.