The animals you'll see most often on a totem pole are the eagle, raven, thunderbird, bear, beaver, wolf, killer whale and frog. and the Coast Salish (say "say-lish") people.the Kwakwaka'wakw (say "kwak-wak-ya-wak"),.The original totem poles were created by only six nations of the western part of North America: Cedar doesn’t rot like other woods do, so it can survive for many years! 7.
Totem poles are typically made from old red or yellow cedar trees. Some totem poles are as high as 18 metres! That’s taller than a street light which averages between 7.5 and 9 metres. Totem poles can represent Indigenous families and clans.īlack, red, white and blue-green were the main colours of paint used on totem poles. The word totem comes from the Algonquian word odoodem meaning “his kinship group.” This means a family or a clan. If you want more discussion then please refer to the other two posts here I've made on the topic: (1) TTL Inverter and also (2) TTL AND.A Tlingit totem pole in Sitka, Alaska. (Just look at the base current into \$Q_2\$.) And it can sink a fair amount of it, in fact. In this state, the output cannot source any current. Then verify that you also agree with me about the equivalent circuit on the right. Using the BJT totem-pole to drive power switches in low-side applications has increasingly been replaced by gate drivers, which come with many built-in. once again:įirst, look at the circuit on the left side and make sure that you agree with me about which BJTs are on and which are off. I've also included the equivalent resulting circuit on the right side. I've added some details about how \$IN\$ is actually driven in a real circuit as well as a few short notes here and there, once again. Here is the schematic in the case where the output is LO.
The drive will typically either be holding \$IN\$ close to ground (with output HI) so that \$Q_3\$ is OFF or else by sourcing a current of about \$700\:\mu\text\approx 12\$. The first thing to understand how the input (labeled \$IN\$ in the schematic) is actually driven. I've added the typical resistor values for TTL here, as well. Why have you selected this kind of drive circuit DrAzzy December 15, 2014, 9:58pm 4 Indeed. If your value for R is small or zero you can destroy the totem. You have to match the characteristics of the NPN an PNP transistors, especially their gain. Simulate this circuit – Schematic created using CircuitLab You have to be careful when you make a totem pole circuit. It's helpful to do so, despite having a "nice picture." If for no other reason, it allows others to quickly snap up and use your schematic as a starting point for adding additional notes. Draw out the schematic using the existing schematic editor that you have access to when writing out your question.
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