Simulating G&L PTB circuit

Pickups, wiring schemes, switch techniques and onboard active electronics for guitars

Simulating G&L PTB circuit

Postby ramonmaruko » 05 May 2018, 04:40

I am trying to simulate the G&L PTB circuit as shown in the schematic that was previously available in the G&L website.

I am having trouble getting the treble cut to work. The treble stays the same regardless of the value of VR2. Any hints as to why it isn't working would be nice. Thank you!

VR1 = Bass cut
VR2 = Treble cut
VR3 = Volume

ptb.png
You do not have the required permissions to view the files attached to this post.
ramonmaruko
 
Posts: 2
Joined: 21 Apr 2017, 08:59
Has thanked: 2 times
Have thanks: 0 time

Re: Simulating G&L PTB circuit

Postby george giblet » 05 May 2018, 08:16

You have drawn the circuit incorrectly.

Even if it was drawn correctly the simulation would not work. The treble control relies on the fact the pickup impedance is present. You have a voltage source. If you load a voltage source you do not change its output voltage. You need to add a pickup impedance model.
george giblet
Breadboard Brother
 
Posts: 85
Joined: 30 Dec 2008, 18:27
Has thanked: 18 times
Have thanks: 36 times

Re: Simulating G&L PTB circuit

Postby ramonmaruko » 05 May 2018, 08:38

Ah right, one of the pins of VR2 should be connected to the input and not to ground. Thank you!

As you've said it still won't simulate correctly. I'll see if I can find a model online.
ramonmaruko
 
Posts: 2
Joined: 21 Apr 2017, 08:59
Has thanked: 2 times
Have thanks: 0 time

Re: Simulating G&L PTB circuit

Postby FiveseveN » 06 May 2018, 15:19

Well you've tied both ends to ground. Look at the referenced schematic again (it's a normal guitar "tone control").
Edit: oops, I messed the replies above. For what it's worth, here's what I use for pickup simulation:
You do not have the required permissions to view the files attached to this post.
Ignorance more frequently begets confidence than does knowledge. (Charles Darwin)
User avatar
FiveseveN
Resistor Ronker
 
Posts: 414
Joined: 25 Oct 2009, 22:20
Location: Romania
Has thanked: 125 times
Have thanks: 47 times


Return to Electric Guitar Rewiring

Who is online

Users browsing this forum: No registered users and 2 guests