milchmannverleih
Member
- Joined
- Jan 5, 2018
- Messages
- 10
Hello you DIY guys!
First of all, since this is my first post here, I wanted to introduce myself. My name is Phillip, I'm from Germany, I have a "Diplom" in Engineering Physics, but not really a clue when it comes to electonics
I started to get interested in audio equipment during the first recordings with my band in the last years and because I tend to get lost in details I eventually stranded here in the forum.
In the last couple of month I started building audio equipment on my own. My first amplifier (based on the Silver Elements Kit by Hairballaudio) should be ready by next week, so I am looking for my next challange. 8)
In order to create my own channel strip eventually I decided to build an EQ next, and because I really like the sound of the Soundtoys "Sie-Q" VST plugin I am very interested in the "Siemens W295b" EQ.
Instead of buing some old crap from ebay and trying to refurbish it, I decided to take a look at the schematics and try to understand what's going on in there first.
Based on the schematic attached I started modeling the circuit in LTSpice, using modern transistors similar to those in the schematic but still available. The input stage of my simulation does as it should do, but the following RC-Network for bass and treble control does some nasty stuff to the frequency response.
I will attach the schematic of my simulation in the next post.
Can you explain to me what the RC-network is doing exactly?
It is not a classic Baxandall network, is it?
Why are there two outputs feeding the following stage?
Can you spot any mistakes in the simulated circuit? (Junction in a place where there shouldn't be one etc.)
Thanks in advance!
Phillip
First of all, since this is my first post here, I wanted to introduce myself. My name is Phillip, I'm from Germany, I have a "Diplom" in Engineering Physics, but not really a clue when it comes to electonics
I started to get interested in audio equipment during the first recordings with my band in the last years and because I tend to get lost in details I eventually stranded here in the forum.
In the last couple of month I started building audio equipment on my own. My first amplifier (based on the Silver Elements Kit by Hairballaudio) should be ready by next week, so I am looking for my next challange. 8)
In order to create my own channel strip eventually I decided to build an EQ next, and because I really like the sound of the Soundtoys "Sie-Q" VST plugin I am very interested in the "Siemens W295b" EQ.
Instead of buing some old crap from ebay and trying to refurbish it, I decided to take a look at the schematics and try to understand what's going on in there first.
Based on the schematic attached I started modeling the circuit in LTSpice, using modern transistors similar to those in the schematic but still available. The input stage of my simulation does as it should do, but the following RC-Network for bass and treble control does some nasty stuff to the frequency response.
I will attach the schematic of my simulation in the next post.
Can you explain to me what the RC-network is doing exactly?
It is not a classic Baxandall network, is it?
Why are there two outputs feeding the following stage?
Can you spot any mistakes in the simulated circuit? (Junction in a place where there shouldn't be one etc.)
Thanks in advance!
Phillip