know a site for electonic circuits that uses 4 operational amplifiers?

Question

does anyone here know a site where i could find circuit diagrams that uses 4 op-amps? most of the schematics i found only uses 1-3 op-amps. i prefer those projects that have LEDs in them. they're more fun to make. hehehehe

Answer 1

You might fancy this one, it is a sound level meter using Op Amps and LEDs:
http://www.zen22142.zen.co.uk/Circuits/Audio/vumeter.htm
So instead of 8 Op Amps you only use 4, and instead of the 1KΩ resistors, you use 2.2kΩ.
Have fun!

Answer 2

Op-amps are very versatile ICs.
I am sure circuits with with more than four would be common.
Radio shack should have books about op-amps.
LEDs are very useful and can be fun to work with.

Answer 3

a potentiometer includes a resistor (A to B) and a wiper arm(C) ..A----///////----B .............. ^ .............. | ..............C (forget on the subject of the .'s) might beconnected in certainly one of two methods. A.) As a variable resistance (single resistance) connect C to the two A or B B.) As a variable Voltage divider (twin resistance) connect A & B to voltage and develope a proportional voltage on C reckoning on there huge sort in use,placement and connection in an Op Amp circuit they could be used for here: a million.) comments administration - i.e. income Adjustment 2.) Offset adjustment 3.) Hystersis administration 4.) reimbursement of resistance tolerances 5.) quantity administration - adjustment of enter voltage 6.) Voltage adjustment on an enter the two the + or - for use as a comparator

Answer 4

Try here ...

http://focus.ti.com/lit/ml/sloa088/sloa088.pdf