Solid State Guitar Amp Forum | DIY Guitar Amplifiers

Please login or register.

Login with username, password and session length
Advanced search  

News:

SSGuitar has been upgraded to SMF v2.0.15!

collapse
Pages: [1]   Go Down

Author Topic: Biasing  (Read 336 times)

Vigo

  • SSGuitar Apprentice
  • **
  • Chip Points: 0
  • Posts: 5
    • View Profile
Biasing
« on: August 03, 2017, 01:18:24 PM »

Hello! I've designed this biasing circuit (see picture) and was wondering if i should rather go with lower resistors to keep the current flow maximal or if this had no real impact, this will mainly be used to power up an op-amp in a distortion circuit.

Logged

phatt

  • Legendary
  • ******
  • Chip Points: 202
  • Posts: 1773
    • View Profile
Re: Biasing
« Reply #1 on: August 06, 2017, 07:10:11 AM »

Your circuit needs filter caps on each node,, but there are better ways. ;)

I'll assume you are trying to drop from a large voltage (of say a power amp circuit) down to a low preamp voltage?
If so then just look at the hundreds of SS Amp circuits and you will see how it's done.
Fender often use a large wattage drop resistor then a Zener diode to regulate the low voltage.

Or you can use a common LM7809 3 terminal regulator to get a stable 9VDC supply. Though you still may need a drop resistor as the LM78xx series can only handle about 35 VDC,, check the data sheets. 8)

BTW, there is no need to run your dirt circuit from 9Volts,, just use 15VDC regulator (LM7815) and be done with it.
There's plenty of pdf's around showing how to use LM79xx regulators,, just google the data sheets.
Phil.
« Last Edit: August 06, 2017, 07:18:50 AM by phatt »
Logged
Pages: [1]   Go Up
 

* User Controls
 
 
Welcome, Guest. Please login or register.
Did you miss your activation email?
* Recent Posts
Crate flexwave 15r problem by urkelino
[Today at 01:21:03 PM]


First real build. LM386. by flester
[Today at 06:24:42 AM]


Traynor Bass Mate 25 Power Supply Over heating. by Enzo
[January 22, 2018, 08:33:04 PM]


Traynor YVM-10L Powered Mixer Schematics by fuzzythebear
[January 22, 2018, 02:37:46 PM]


Peavey VIP 2 buzzing/crackling by Jazz P Bass
[January 21, 2018, 10:47:08 AM]

* Sponsors