Pages: [1]   Go Down
Author Topic: Help with creating a synth  (Read 443 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Newbie
*
Karma: 0
Posts: 8
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

I am relatively new to electronics and I want to make an analog synth controlled digitally by an arduino.  But before I really get started, I would like to see if anyone could help me comprehend this circuit and help me understand the use of the op amp.  http://www.falstad.com/circuit/e-triangle.html
Logged

Austin, TX
Offline Offline
Faraday Member
**
Karma: 71
Posts: 6146
Baldengineer
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

There is a detailed description of the circuit on that page.  What are you not understanding?

More information on the Op Amp can be found here:
http://en.wikipedia.org/wiki/Operational_amplifier
and
http://en.wikipedia.org/wiki/Operational_amplifier_applications
Logged

Capacitor Expert By Day, Enginerd by night.  ||  Personal Blog: www.baldengineer.com  || Electronics Tutorials for Beginners:  www.addohms.com

Offline Offline
Newbie
*
Karma: 0
Posts: 8
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

I still cant grasp the general concept of op amps... Ill keep reading.
Logged

Phoenix, Arizona USA
Offline Offline
Faraday Member
**
Karma: 40
Posts: 5575
Where's the beer?
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

I still cant grasp the general concept of op amps... Ill keep reading.


The general concept of an opamp is in its name: Operational Amplifier. Its designed to perform mathematical operations on analog signals; in fact, that was one of its original uses, as a mathematical component for analog computers (which were typically faster and typically smaller than the room/building sized digital behemoths which they competed with from the 1930s-1950s - though less accurate, of course).
Logged

I will not respond to Arduino help PM's from random forum users; if you have such a question, start a new topic thread.

Central MN, USA
Offline Offline
Tesla Member
***
Karma: 73
Posts: 7197
Phi_prompt, phi_interfaces, phi-2 shields, phi-panels
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

KE7GKP,

You are off by like 10,000. A typical op-amp has 10^6 gain at 1Hz but that makes no difference. I would try to understand an op-amp with the two "golden rules" and an inverting amplifier circuit. You do need to know Ohm's law to fully understand the rule. The inverting amplifier amplifies signal by a gain and inverts the signal. The inverting part makes no difference on audio signals though.
Logged


Cumming, GA
Offline Offline
Edison Member
*
Karma: 20
Posts: 1655
Ultimate DIY: Arduino
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Maybe it will help if you read some background on op amps.... from an expert.
http://www.analog.com/static/imported-files/seminars_webcasts/Op%20Amp%20Applications%20Book%20(PDF)/P2%20ChH_final.pdf
Logged

Pages: [1]   Go Up
Jump to: