IC 7402 is different from the other type of IC like 7404,7408,7432 and 7400 when it is connected to have an output desired... if you noticed all i mentioned ic is connected from left to the right. input pin 1 and 2, output pin 3 input pin 4 and 5, output pin 6 input pin 13 and 12, output pin 11 input pin 10 and 9, output pin 8 while in nor gate, to have the desired output it must be connected from right to left... input pin 2 and 3, output pin 1 input pin 5 and 6, output pin 4 input pin 8 and 9, output pin 10 input pin 11 and 12, output pin 13
L293D is having 20 pin IC and also 16 pin IC. description of 20 pin is: 1-enable 1 2- input 1 3- output 1 4,5,6,7,14,15,16,17- ground 8- output 2 9- input 2 10,20-vs 11-enable 2 12- input 3 13-output 3 18-output 4 19-input 4 description for 18 pin: 1-enable 1 2- input 1 3- output 1 4,5,12,13- ground 6-output 2 7- input 2 8,18-vs 9-enable 2 10-input 3 11-output 3 14-output 4 15-input 4
According to the datasheet the output on pin 1 of that transistor is a maximum 4.5 volts
7 active pins 4 inputs 1 output pin
The 7812 is not a logic gate. It is a three terminal voltage regulator with an output of +12V.Looking at the pins of the TO-220 device, with the flat side down, the left pin and the case is common, the center pin is input,and the right pin is output. For the smaller TO-92 78L12 device, the left pin is output, the center pin is common, and the right pin is input
Datasheets say 10mA per/output pin...
The LM7805 is a linear voltage regulator that produces a relatively constant output voltage of +5VDC. There is an input pin, which must generally be greater than +7VDC, a ground pin, and an output pin. If the ground pin is connected to a resistor divider network between output and ground, it can be made adjustable for an output voltage greater the +5VDC. Its rating is 1A, but boost circuits can be built to give it more capacity.
Input! x
http://hamradio.lakki.iki.fi/new/Datasheets/transistor_pinouts/case-14.gif Picture in context can be found here: http:/hamradio.lakki.iki.fi/new/Datasheets/transistor_pinouts
Pin 1 - Battery + Pin 2 - Battery - Pin 3 - Output Signal - May not be needed Pin 4 - Keyswitch. Turns display off when key is off. Can be wired to Battery + if you want it on at all times.
Pin used to eliminate the effect of internal component voltage on the output of the device.
Check for shorts to ground from your output pin