Electronics Experiments: Audio Amplifiers
||Previous Page__Next Page|
To Alpha. Index To Manuf. Index To Category Index Part No. Index
WEB SPECIALS NEW PRODUCTS VIEW CART
Back to Tips Index
There are applications of Op-Amps, such as in active filter circuits, that require a precise gain. Such circuits often use the non-inverting configuration as shown in Figure 1 below. The gain of the amplifier is given by the equation below. Note that the gain must be greater than unity (i.e. Av greater than 1).
Ra Av = 1 + ------ Rb
There are two ways to achieve a precise gain:
The FIND_R program is small and quick. It runs in a DOS box under Windows. When run, FIND_R prompts you for the gain you want to achieve. It then finds the best combination of values to give you that gain. It also calculates the actual gain you achieve using those values, as well as the percent error between the desired gain and the actual gain. The percent error is typically in the range of 0.00 % to 0.03 %, which is well within the tolerance of 1% resistors.
If you find this program to be useful, please let us know. If you have any suggestions for other utility programs, please pass them along. Someone on our engineering team just might write a program to do it.
Back To Tips Index
Our IndexesProduct Index
Part Number Index
Web Only Products
New Products Index
email@example.com - General Questions and Comments
firstname.lastname@example.org - Technical Questions