Did you find DM-36?. I am looking for the same part. If you found it plese provide me the source. I have a KV-27HFR that use the same part and I can't find it. I am planning to design an equivalent circuit just a comparator that control the current of the diode in the optocoupler. If you find the part I will save time. If you did not find DM-36 and if my circuit works ok I can provide it so you can make it. I think that the power supply schematic of your model is similar to the power supply schematic of the KV-27HFR. I will appreciate if you send a copy to me. thanks Jaime