It will also see whatever capacitance is at the input x100 + the parasitic capacitance of the transformer. The S/N will also suffer. Still, it doesn't hurt to try.
Well, I could reduce the gain so to feed it with a Sounsmith cart but I need to have 47k load impedance.... how can I do that without the trafo ?
is the imput impedance of the paradise high enough ?
is the imput impedance of the paradise high enough ?
In the schematic of post 10938 the input resistor is missing anyway.
The circuit does not work properly without. Change it to 47 k and
check for no dc / oscillation..
The circuit does not work properly without. Change it to 47 k and
check for no dc / oscillation..
I remenber Joachim informed natural input impedance should be around 10k
If so, even with 47k load, the cart can not see more than 10k..... am I in the right direction ?
Anyone has a method for simulating input impedance ?
If so, even with 47k load, the cart can not see more than 10k..... am I in the right direction ?
Anyone has a method for simulating input impedance ?
This may be true - I am too lazy to calculate it now.
You can always measure the input impedance.
Depending on the cartridge 10k may be OK.
This is Try It Yourself Audio.
You can always measure the input impedance.
Depending on the cartridge 10k may be OK.
This is Try It Yourself Audio.
Try It Yourself..... 🙂
That is why I was considering the SDT
maybe I can place a jfet follower in the imput to have high impedance and than reduce the voltage with a L pad......
That is why I was considering the SDT
maybe I can place a jfet follower in the imput to have high impedance and than reduce the voltage with a L pad......
A rough calculation gets me around 1k2 input impedance,
β taken as 200 and Ut 28 millivolts (warm transistor).
Other gentlemen agree ? Schematic again post 10938.
β taken as 200 and Ut 28 millivolts (warm transistor).
Other gentlemen agree ? Schematic again post 10938.
According to the data sheet of BC337-40 current gain may be 400
rather than 200 so Re would be 2k4 according to your simulation ..
I think 1k2 is on the money. A friend has simmed the whole circuit and he came up with the same figure.
