|Home > Circuits > Sound/Radio > Transistor Organ|
|This simple circuit can provide hours of enjoyment as you learn tunes, play duets or just make some really weird sounds by pushing all the buttons at once. You have probably seen this ciruit before, it is fairly common. I have seen it in several books. The best thing about the circuit is that you can tune each individual note, or go to a whole new octive by changing one capacitor (C1). Because of this, it is possible to from an entire Transistor Organ ensemble. Why you would want to do this is anyone's guess...|
|Add A Comment|
|Can I add the pots for more tones? And, what capacitor should I use if I want to go to lower or octaves? Thanks|
|I love this organ but do have to admit, i wish there were more notes or something like a piano with black and white keys.|
|could you add more trimpots to make it have more notes|
|I finaly got this to work with 2n4891 and 2n2646. but dident work with either until i modified.left r13 out,you dont nead volume on this and it messes with the oscilation. moved incoming leg of c2 to e of Q1 standard relaxation oscilator. flip B1 and B2 of Q1 it dont work unless you do.still dident have enough volume to hear out of speaker but was thear on scope so i eleminated Q2 and used the 741 op amp circuit from your guitar fuzz minus the 2 diodes and resistor from the clipping portion of the circuit. IT WORKS.IT WORKS IT FINALY FLIPPIN WORKS!!!|
|having a little trouble finding a cross for 2n4891. found a fiew ,4891s but nead about 50. for trans/synth. project.|
|I, too, would be interested to know what kind of capacitor would allow a change of 1 octave.|
|just finished a school project on this circuit. works great! best regards, dan|
|Hello! The 2N4871 is work in this circuit in a place of Q1 ?|
|If you're planning to use a 2N2646, make sure you flip the bases (i.e. base 1 should connect to R12/R13 and base 2 should connect to R9) otherwise it won't work.|
|So the octave change is as easy as changing one capacitor right? what should the value be? is there and equation? a power of 10 to the capacitor value? and secondly this organ is monophonic right?|
|The last 10 comments are currently shown. Show All Comments.||Add A Comment|
If you would like to leave a comment, you can do so using the form below. Comments can be things like suggestions, successes or failures, improvements, similar circuits, error reports, an answer to a previous commenter's question, or anything in between. However if you would like to ask a question it is suggested that you use the forum instead. The forum provides a more robust environment for discussion.
Important: If you post a technical question here, there is no guarantee it will be answered. All technical questions should be posted to the forum. The owner of this site generally does not answer questions in comments.
All comments are subject to approval before they are displayed here, so your comment will not appear immediately. This is done mainly to prevent spam and other abuse. If you wish to remain anonymous, simply enter "anonymous" for your name and/or email.
Back To Circuits Page | Mail Me | Search