Thursday, October 29, 2015

What liquid can be used for solar heaters, Τι υγρό χρησιμοποιούμε στους ηλιακούς θερμοσίφωνες

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Με δικη σας ευθύνη. Διαβά ζοντας το datasheet της BASF για το Glythermin P44 http://glythermin.ru/d/599572/d/ti-glythermin-p44.pdf  ...
Tuesday, October 27, 2015

Pleiades 1:10 microphone input transformer

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Turns ratio approx 35 to 350. Proximity compensation due to 47mH primary inductance. Secondary inductance 5.1H. Fully balan...

Microphone Systematic Error

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The bass reduction during the first few minutes was apparently due to the MD-421ii used in the experiments. It sounded great even with no p...
Monday, October 19, 2015

Can a JFET be made to behave like an electron tube?

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Could it be that adding a diode + resistor to a JFET across gate make it have automatic gain control for many Megohms Rg or simulating elec...
Friday, October 16, 2015

How to reduce excessive bass and pop filter when your Shure SM-58 is used at a very close distance

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How it's done: Some turns of insulated wire are wound on a toroidal ferrite or nanoperm core. The 2 ends of the inductor are s...
Thursday, October 15, 2015

Pleiades Electra JFET Headphone Amplifier No Components

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This is a source follower and the headphone coil (one for each ear channel) acts as the source resistor itself. Some idea as on elec...
Wednesday, October 14, 2015

Pleiades 12V battery powered 12AU7 microphone pre preamplifier or DI with positive bias resistor from plate (anode) to grid to free electrons

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This is a mod of a pre amplifier made in around 2000 using an ECC86 which did not work quite well. Many years later it was replaced with 1...