I want to understand how this electronic circuit work ?
http://hyperphysics.phy-astr.gsu.edu/HBASE/Electronic/ietron/nand4.gif
This electronic circuit needs to do NAND gate
In this sketch there used two 2N222 transistor but I build this circuit with two 1815 transistor
My problem is that if I connect to A + 6 volt the led light weak without dependence on B
But how this organize whit the NAND gate
http://hyperphysics.phy-astr.gsu.edu/HBASE/Electronic/ietron/nand4.gif
This electronic circuit needs to do NAND gate
In this sketch there used two 2N222 transistor but I build this circuit with two 1815 transistor
My problem is that if I connect to A + 6 volt the led light weak without dependence on B
But how this organize whit the NAND gate