Thank you Miib... As there is a 100r between the zener string and TP3 I was not shure 🙂
Now another noobness.... Why the need for 2 x 6800u on the input ?
What is the purpose of those caps ?
How low can I go if I decided to reduce this values ?
Now another noobness.... Why the need for 2 x 6800u on the input ?
What is the purpose of those caps ?
How low can I go if I decided to reduce this values ?
A 1 pico Ohm resistor is innovative so Rams would aprove on that.
Ricardo, without those caps the circuit would have no bass.
Why that is : It forms a high pass filter with the forward impedance of the input stage
( sans the mirror that is ) and that is very low because we want low noise into low impedances. How the circuit works in detail ?
Apply for a PHD degree at Gerhard University.
Ricardo, without those caps the circuit would have no bass.
Why that is : It forms a high pass filter with the forward impedance of the input stage
( sans the mirror that is ) and that is very low because we want low noise into low impedances. How the circuit works in detail ?
Apply for a PHD degree at Gerhard University.
So those caps are responsible by the circuit bass response.... These are very important units.
Bass depends on those caps.... Now I am wondering about cap quality 🙂
I am working with available parts in my sock (4700u, 3300u and 2200u Pana FC).
As for the Gerhard PHD.... I want to but I must have to learn a lot before that... I am glad you are not like some that only share ideas with other PHD´s.
The issue is the cap size... only small caps will fit. I will experiment with what I have got and will tune after with bigger capacity caps.
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2 x 4700uF FC will do just fine. They have approximately 5mOhm @ 100kHz in parallel so they are wide band enough. The FM have 40% less impedance, so what. In the bass both are ANIMALS. Charge them and discharge them. How long is the spark ?
thats R19, where michael said to let space for a bigger resistor due to higher power dissipation
Most probably for thermal constraint, automotive design normally would be for -50C to +100C many (many many ...) cycles. Internal bounds, lead bounds and material tolerance could be at risk.
(that is where I come from 🙂)
(that is where I come from )
Well well, we can shake hands than buddy 🙂
Likewise here 😀 and agree fully with you.
Audiofanatic 😉
Well well, we can shake hands than buddy 🙂
Likewise here 😀 and agree fully with you.
Audiofanatic 😉
stuffing is finished ;-)
boards are full - power up planned for monday ;-)
this is with LCR caps, Dale resistors, and as good a matching as I could get. Input transistors are matched to 0.7% between all of them, the rest less... Its probably required to order 200...300pcs of each transistor type to get a perfect matching.....
boards are full - power up planned for monday ;-)
this is with LCR caps, Dale resistors, and as good a matching as I could get. Input transistors are matched to 0.7% between all of them, the rest less... Its probably required to order 200...300pcs of each transistor type to get a perfect matching.....
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Cool, and I can be a bit more specific on that. Once (a long time ago) I worked for Motorola, HP and International Rectifier (among others) as an industrial 'components in-design specialist', working with our customers helping with their designs (at the customer’s site) mostly do select components to fit them to their specific environment. I have done planes, trains and automobiles (among others, including the particle accelerator in Cern 🙂).