Aan

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

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

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

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.

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.

Hi Shahriar, Do you have walktrough to interface microcontrolers with CRT ? Can you share with us ? Best Regards.

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 ?

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.

Hi, i need datasheet for IC +--------------------+ |

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).

Here is additional information..

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

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.

What company name which hast that logo ?

Here is the company logo.

Thanks again. :)

Hi, i need datasheet for IC ++++++++ | 4151D | ) JRC | | 6004 | ++++++++ Regards.

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

Thanks hotwaterwizards, like always :D

Hi, i need optocoupler PC515 datasheet. Regards.

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

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

Thanks All.

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

So this device is a SBS semiconductor ? Thanks.