(http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=45925&g2_serialNumber=2)
(http://www.aronnelson.com/gallery/main.php?g2_view=core.DownloadItem&g2_itemId=45928&g2_serialNumber=2)
Si transistor boost.
Based on a circuit I built year ago with a TIP29 as the transistor.
R11 is an external bias adjust control for tone variations.
R2 and R1 are a single 10K audio volume control.
Circuit starts at R7.
V1 is a 9VDC battery
Bias control is for extra tones don't get stuck at 7VDC at the collector you might like the sound at a different collector voltage.
The graph shows the input cap value changing, it is .068uf X .1 (.0068uf green) then .2(.0136uf blue) then .3 etc.
A 2N4401 is a nice transistor for circuits like this.
Textbook circuit the small difference is the bias control and where it is in the circuit
Have fun
Gus
Luv the graph showing input cap affect. ;)
I hope the graph helps people understand what is happening with changing the input cap.
Another thing that is interesting is changing the inductance of the pickup and also modeling the guitar or bass etc with more pickups switched/blended in. The graph changes with input sources.
The circuit above is a Si NPN input high pass filter type boost.
People that have tried the TIP29 version with a bias control often like it and find the bias control interesting for the changes in tone.
Cool
Is there a simple way to get a dip in the mids without adding a pot ?
Anyone build this yet? It is a silicon treble boost kind of like a RM but with a bias control R11.
The bias control(external control on the box) is not a hack 100k to 600k was selected as a good range. I can give it one value for R5 and R11, however I like how the tone changes with different bias settings.
TIP29 and 2N4401 were posted for a reason
Brymus
It is a one transistor RM like if you want a kind of dip you will need to add some parts. Maybe I will sim some ideas and post them.
Brymus
You question about a dip in the mids got me thinking. The circuit in the following link is a simple add on for a small amount of mid control. It is the cap blend type control that people have used and posted here.
Question who was the first to post the blend circuit?
I simmed different cap and potentiometer values, this set of values looked interesting in the graphs.
http://www.diystompboxes.com/smfforum/index.php?topic=93926.0