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10-03-2018, 01:41 PM
Library parts: Devices (Part-3)
When we add the heater symbol to the dualtriode Device editor, we use the NAME function to call it "H". You can leave the Add=Next and then as you drop the triodes onto the schematic, each left click will result in triode, triode, heater, triode, triode, heater, and so on. This is a sure way NOT to forget to connect the heaters on your board !
Alternatively, you can change the Add level of the heater to Add=Request. In this case, dropping triodes onto the schematic results in ONLY the triode portions of each package to be added. If you want to add the heaters, you go to the INVOKE icon on the left-hand toolbar of the schematic editor, then left-click on one of the triodes. A window opens showing all the elements of that device, with the already added portions in normal text and the yet-to-be-added portions in bold. left-click on the bold heater portion and now this virtual symbol is on the cursor; left-click where you wish to add it to the schematic.
Why would you do it this way? Schematics have a way of "getting out of hand", requiring much more space than you initially envision. It is a good idea to try to maintain a schematic size that will print out on letter-size paper and be readable without a magnifying glass ! To do this, we often have to split the schematic into several "sheets" In such a split, it is convenient if the audio path is on one sheet and the power supply is on another, making the Add=Request for the tube heater a time saver in the schematic rendering. Here is where making the Device and drawing future schematics overlap and the development of one affects the other later.
When we add the heater symbol to the dualtriode Device editor, we use the NAME function to call it "H". You can leave the Add=Next and then as you drop the triodes onto the schematic, each left click will result in triode, triode, heater, triode, triode, heater, and so on. This is a sure way NOT to forget to connect the heaters on your board !
Alternatively, you can change the Add level of the heater to Add=Request. In this case, dropping triodes onto the schematic results in ONLY the triode portions of each package to be added. If you want to add the heaters, you go to the INVOKE icon on the left-hand toolbar of the schematic editor, then left-click on one of the triodes. A window opens showing all the elements of that device, with the already added portions in normal text and the yet-to-be-added portions in bold. left-click on the bold heater portion and now this virtual symbol is on the cursor; left-click where you wish to add it to the schematic.
Why would you do it this way? Schematics have a way of "getting out of hand", requiring much more space than you initially envision. It is a good idea to try to maintain a schematic size that will print out on letter-size paper and be readable without a magnifying glass ! To do this, we often have to split the schematic into several "sheets" In such a split, it is convenient if the audio path is on one sheet and the power supply is on another, making the Add=Request for the tube heater a time saver in the schematic rendering. Here is where making the Device and drawing future schematics overlap and the development of one affects the other later.
