Hopefully we'll arrive at some sort of answer to that in the next little while, when people including myself have a chance to compare the two versions of the phonoclone.
If you want to test it out yourself (it would be an interesting experiment), I can send you both regulator boards as a 2-for-1 deal.
/R
If you want to test it out yourself (it would be an interesting experiment), I can send you both regulator boards as a 2-for-1 deal.
/R
In fairness I thought I should throw out the regulator deal to anyone who might be interested,
1 ea. of the S, X, and Z reg boards for $15 US.
Since almost all my projects have regulators built in to the boards already these regulators are expected to be used for other things, though you can defeat the on board regulation on the VSPS and Phonoclone boards to try these out - its not too hard if you know what you are doing.
/R
1 ea. of the S, X, and Z reg boards for $15 US.
Since almost all my projects have regulators built in to the boards already these regulators are expected to be used for other things, though you can defeat the on board regulation on the VSPS and Phonoclone boards to try these out - its not too hard if you know what you are doing.
/R
Attachments
That got me thinking I should have a more general sale, so I came up with this idea:
Lucky Gift Box clearance sale
Lucky Gift Box clearance sale
I bet you wouldn't want to see the inside! There always comes a point where my best-laid plans start to look like a dog's breakfast. Certainly not up to steampunk wiring, if that means the beautiful looms one finds in teak-framed galvanometer boxes!
That particular size of box (perfect for the bell type transformer I was using) seems to be terribly hard to get hold of through them discontinuing it or something silly. I'd love to use them again. This is my first foray into solid state stuff and I'd like more excuses to use these fine with screw on bottoms.
These are not more beautiful.
1306 Linear power supply MINI aluminum Enclosure AMP case Preamp box PSU chassis | eBay
1306 Linear power supply MINI aluminum Enclosure AMP case Preamp box PSU chassis | eBay
MM on Phonoclone?
Im building up another phonoclone on a pcb Ive had laying around. I dont have a MC cartridge at the moment and was wondering if using a voltage divider on the input would be acceptable for testing purposes. I need to drop down from about 4mv. My question is that although I can calculate resistors that will work, I have no idea how to pick the optimal values in regard to the output impedance of the divider. Is there a better way. I dont want to play with the gain btw.
Im building up another phonoclone on a pcb Ive had laying around. I dont have a MC cartridge at the moment and was wondering if using a voltage divider on the input would be acceptable for testing purposes. I need to drop down from about 4mv. My question is that although I can calculate resistors that will work, I have no idea how to pick the optimal values in regard to the output impedance of the divider. Is there a better way. I dont want to play with the gain btw.
You just hook it up to the cartridge directly. The phonoclone gain is self-adjusting, compensating automatically. Since the MM cart has a much higher output impedance (Zout ~500 ohms) the phonoclone first stage gain naturally falls as R2/Zout.
This will be fine for testing, but the problem for serious listening is the Zout of the MM cart is not usually constant with frequency, introducing unwanted response variation.
This will be fine for testing, but the problem for serious listening is the Zout of the MM cart is not usually constant with frequency, introducing unwanted response variation.
It's because the phonoclone is a current amplifier. The first stage is an inverting op amp with zero series resistance connected to the inverting terminal (zero input load, seen from the perspective of the cartridge aka a current amplifier), making the output voltage proportional to the input current.
/R
/R
