Hi I'm new to the forum. I was looking at a schematic and saw a symbol of a resistor with a circle around. Above it it says TR1. If someone could tell me what this is it would be great!
Call it an "Inrush current limiter", or NTC (Negative Temperature Coefficient) Thermister or "Thermal resistor"
When cold, the device has a higher resistance than warm. They are selected based on expected current.
Many moons ago, I remember them being called "Globar Resistors" and they were found exclusively in the degausing circuits of Color TV's. They were a common component at the Electronics Store.
I have another question if you're willing. Also on the schematic there are spots where the line stops at a dot and says some number with a "j" in front of it, for instance, "j46" I looked all over the schematic and cannot find where they are supposed to connect. I don't get it.
My best guess is a Test Point. Post a pic of the board. if you just joined, it may take 24 hours or so and links could be stuck in moderation. Use go advanced/manage attachments.
They look like female connectors, if you ask me. The wires terminate in a rectangular-shape, probably signifying the position of an external connector.
Der Strom
Yep wierd. Non standard. They appear to refer to "breakaway" portions of the circuit. They may have been created to keep some PCB design rules happy. Nonetheless, they mate with -1 or +1 of the designation. P and J may have made more sense, but they might be just wires.