triac Optotriac doesnt turn off

Description: There are no issues with powering it on, but after disconnecting the input (with no input current), the triac remains on. The load operates at standard RS-232 voltages (+/- 12V) with a speed of 56k. It was mentioned that an OptoTriac has already been used, so a schematic detailing the connection, power source (e.g., voltage, whether it shares the same ground as the modem/PC), etc., would be beneficial. The clearer the question, the easier it is to provide an accurate answer. If there are no schematics available, it is important to note that having a circuit in mind and attempting or simulating it is necessary. If a TRIAC was used and did not function, providing a circuit diagram would be helpful in seeking assistance.

The described circuit involves a triac that is intended to control a load operating at RS-232 voltages. The RS-232 standard typically involves signaling voltages of +12V and -12V, which are used for serial communication. In this case, the triac is expected to turn off when the input current is removed; however, it remains on, indicating a potential issue with the control circuitry or the triac itself.

To troubleshoot this circuit, it is essential to ensure that the gate of the triac receives the appropriate signal to turn off. This can be done through various methods, such as using an optoisolator (OptoTriac) to provide isolation between the control signal and the triac. The optoisolator should be connected to the input signal, and its output should control the gate of the triac. It is also important to verify that the triac's gate is not being inadvertently triggered by noise or residual voltages after the input is disconnected.

Additionally, the power supply configuration should be assessed. If the triac shares a ground with the modem or PC, any ground noise could affect its operation. It is advisable to use a separate power supply for the control circuitry or to implement proper decoupling techniques to minimize interference.

A schematic diagram should include the following components: the RS-232 interface, the optoisolator, the triac, and any necessary resistors or capacitors for stability and protection. The circuit should clearly indicate the connections between these components, including the power supply connections, ground references, and any signal lines.

In summary, a comprehensive approach to troubleshooting the triac operation involves examining the control signal configuration, ensuring proper isolation and ground management, and providing a detailed schematic to facilitate accurate diagnosis and support.No problems turning it on, but after I unload the input (no input current), the triac doesn`t turn off. The load is standard RS-232 voltages (+/- 12V), speed 56k. You mentioned you have already tried using an OptoTriac, so the schematic of how you connected it, power source (e.

g. voltage, whether it shares the same ground as the modem/PC) etc, is the kind of thing that would come in handy. The clearer the question the easier it is to give an accurate answer. Oli Glaser Oct 29 `11 at 2:47 If you continue asking questions in this manner people will get tired of trying to help you. |If you can say "I have no problems turning it on, but after I unload the input (no input current), the triac doesn`t turn off.

" - you MUST have a circuit in mind and must have tried it or simulated it. To then just say "I have no schematics yet" (if you wrote that) is missing the point. | IF you tried using a TRIAC and IF it did not work then you will be able to provide a circuit diagram somehow, and should. If you won`t do people the courtesy of doing that you`ll rapidly lose people willing to help. Russell McMahon Oct 29 `11 at 10:14