If you are building a Mixer or a Small Summing Mixer, I advise you to get and reference the Geoff Tanner's Technical Information Sheets, you can get info on how to purchase them here:
http://auroraaudio.net/forums/topic/sound-on-sound-magazine-reviews-technical-information-sheets
It covers a variety of topics:
The 31 topics take up a total of 44 pages and they are broken down into the following headings:-
1.Decibel tables – Illustrating the difference between voltage/current and power ratios.
2.The Decibel – An explanation of how dB ratios work.
3.Reed Matrix Information – The pin functions of the most common reed relay circuit boards
4.Calculating Attenuators – How to calculate attenuators for a given dB loss
5.Bus-bar do's and dont's – How to calculate a resultant bus level and impedance
6.Pan-pots – How to design a stereo pan pot with 3dB loss at the centre
7.Oscillators – How to calculate the components for a Wein Bridge Oscillator
8.DC switching and click suppression – How to minimize switching clicks
9.Transformers – Typical resonant terminations for most output transformers
10.Mixing arrangements with less than 10 feeds – Special considerations
11.Attenuator chart – Values from -1dB to -80dB for 10Kohm and 600ohm attenuators
12.Studer remote control details – For A80, B62 and C37 tape recorders
13.P & G Multi-track faders – How to minimize crosstalk between tracks
14.Design considerations for oscillator switching – To minimize breakthrough
15.Do's and Dont's of console design – plus a parallel resistor rapid calculator.
16.Gain boost chart – For BA283, 3411 & 5 front, 3415, 16 and 3513 rear, 3411/12 rear.
17.Virtual Earth Mixing – Calculations and explanations.
18.Bus Level Calculation Chart – Gives the resultant bus level from six different bus resistors.
19.Coupling Capacitor Value – Formula to calculate value for 0.1dB drop at 20Hz into load R
20.Calculation of Amplifier Gain – Both inverting and non-inverting modes.
21.Bus-bar Resistor Comparison Chart – What resistor to use for a different input level.
22.Pre-fade Mixing Arrangements – Taking a pre-fade mono-mix from a Stereo source
23.Design of Stepped Attenuators – How to calculate each step of the switch
24.Design of Calibrated Potentiometers – How to calculate +/- dB range potentiometers.
25.Switch “Trickery” - How to design clever switch functions.
26.Use and characteristics of Amplifiers – Input Z, Headroom, and how the amplifiers function.
27.Coupling Capacitors – Further thoughts on the choice of coupling capacitors
28.Ohm's Law Nomogram – Place a rule across the columns to calculate any unknown.
29.Design of remote gain boost potentiometers – to drive multi-track faders and mixes.
30.Typical Recording Studio Layout – Explains contemporary functions like “Overdub”
31.Potentiometer Slugging – What resistor to use for -10dB at half rotation.
Plus a chart giving the gain boosting required for rare 3401 and 3402 Line amplifiers
http://auroraaudio.net/forums/topic/sound-on-sound-magazine-reviews-technical-information-sheets
It covers a variety of topics:
The 31 topics take up a total of 44 pages and they are broken down into the following headings:-
1.Decibel tables – Illustrating the difference between voltage/current and power ratios.
2.The Decibel – An explanation of how dB ratios work.
3.Reed Matrix Information – The pin functions of the most common reed relay circuit boards
4.Calculating Attenuators – How to calculate attenuators for a given dB loss
5.Bus-bar do's and dont's – How to calculate a resultant bus level and impedance
6.Pan-pots – How to design a stereo pan pot with 3dB loss at the centre
7.Oscillators – How to calculate the components for a Wein Bridge Oscillator
8.DC switching and click suppression – How to minimize switching clicks
9.Transformers – Typical resonant terminations for most output transformers
10.Mixing arrangements with less than 10 feeds – Special considerations
11.Attenuator chart – Values from -1dB to -80dB for 10Kohm and 600ohm attenuators
12.Studer remote control details – For A80, B62 and C37 tape recorders
13.P & G Multi-track faders – How to minimize crosstalk between tracks
14.Design considerations for oscillator switching – To minimize breakthrough
15.Do's and Dont's of console design – plus a parallel resistor rapid calculator.
16.Gain boost chart – For BA283, 3411 & 5 front, 3415, 16 and 3513 rear, 3411/12 rear.
17.Virtual Earth Mixing – Calculations and explanations.
18.Bus Level Calculation Chart – Gives the resultant bus level from six different bus resistors.
19.Coupling Capacitor Value – Formula to calculate value for 0.1dB drop at 20Hz into load R
20.Calculation of Amplifier Gain – Both inverting and non-inverting modes.
21.Bus-bar Resistor Comparison Chart – What resistor to use for a different input level.
22.Pre-fade Mixing Arrangements – Taking a pre-fade mono-mix from a Stereo source
23.Design of Stepped Attenuators – How to calculate each step of the switch
24.Design of Calibrated Potentiometers – How to calculate +/- dB range potentiometers.
25.Switch “Trickery” - How to design clever switch functions.
26.Use and characteristics of Amplifiers – Input Z, Headroom, and how the amplifiers function.
27.Coupling Capacitors – Further thoughts on the choice of coupling capacitors
28.Ohm's Law Nomogram – Place a rule across the columns to calculate any unknown.
29.Design of remote gain boost potentiometers – to drive multi-track faders and mixes.
30.Typical Recording Studio Layout – Explains contemporary functions like “Overdub”
31.Potentiometer Slugging – What resistor to use for -10dB at half rotation.
Plus a chart giving the gain boosting required for rare 3401 and 3402 Line amplifiers
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I'll drop him an email. Thanks.
