Hello,
I have a circuit that I need to modify, the operating principles of the modified circuit have to stay at same as original circuit, or as close as possible. Basically I have a heating circuit with 4, 5Ohm 50W resistors as shown in the schematic below. (the original circuit)
![heatingElements.PNG heatingElements.PNG](https://www.electro-tech-online.com/data/attachments/51/51614-97b94a32d1453a3d16e67e295c211fe8.jpg)
The problem is that the source voltage is going to change to 120VAC instead of 28VAC. In the original circuit each resistor generates about 39W of heating power for a total of about 156W.
I can't change the original resistors.
I can add resistors, I have many different type.
I can use a transformer to drop the 120VAC down to the 28VAC. (Trying to avoid this).
Any Ideas will be appreciated.
I have a circuit that I need to modify, the operating principles of the modified circuit have to stay at same as original circuit, or as close as possible. Basically I have a heating circuit with 4, 5Ohm 50W resistors as shown in the schematic below. (the original circuit)
![heatingElements.PNG heatingElements.PNG](https://www.electro-tech-online.com/data/attachments/51/51614-97b94a32d1453a3d16e67e295c211fe8.jpg)
The problem is that the source voltage is going to change to 120VAC instead of 28VAC. In the original circuit each resistor generates about 39W of heating power for a total of about 156W.
I can't change the original resistors.
I can add resistors, I have many different type.
I can use a transformer to drop the 120VAC down to the 28VAC. (Trying to avoid this).
Any Ideas will be appreciated.