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And the planet spins and life goes on. This has been a build from hell, nothing is normal, no chassis, or priced out of sight. My two preamp modules are 6" x 3" x 1.5" first I tried the guerrilla break which was very disappointing. I had the right Idea but I should have / could have mounted some hinges and that should have made a nice bend. So shell out more $$ on aluminum and pop rivet gun (the first one was defective, oh joy) the Arrow Gun does not always release the mandrel or stem of the riv ...
Well, life is still not on a good keel. I picked up at Fry's a proto shield, and some optocouplers. So the world keeps spinning and I am using a software controlled power-supply I don't have a formal sketch but this is what it will do: Code ? setup () {      int relay[] = { pin2, pin3, pin4 };      int sscr[] = { pin5, pin6, pin7};      int lamps[] = { pin8, pin9, pin10, pin11 };      int TRUE = 1;   ...
Well, life really sucks a good friend of mine is dying and I have been out of town for the last week or so. And I am going back tomorrow. The Gorilla Brake did not work for the two smaller boxes so pop-rivets will work. The power supply is a nightmare and I will get around to that later. For the time being, I plan on using the power outputs from my beloved Dynakit Stereo 70 which has power take-off sockets on the rear 360vac-0-360vac. I will most likely use both sides of the transformer so that ...
Back to Analog Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   CVBoard is a board designed to generate two Control Voltage (CV) signals using Arduino. This prototype is destinated to analog synths and EuroRack modules enthusiast. CVBoard  has two jack outputs from which it is possible to take the CV signals, driven by Arduino’s digital ports that support P ...
kk99

LED fade in/out effect

Posted by kk99 Dec 1, 2018
Merry Boxes & LEDs Enter Your Project for a chance to win a Maker Tool Kit, an Oscilloscope Grand Prize for the project that brings the Most Joy to the Heart, and Gift to Gives! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll     The basic idea was to create a simple LED fade in/out effect circuit. I have used here a single dual op-amp NJM4556 which first stage is configured in comparator mode and second stage is configured as integrator. Tria ...
Normally I would have just bought some aluminum boxes but the prices are ridiculous, and I did not have a finger break to make my own. Having no real metal brake, I had to improvise. and the results were better than I had hoped for. So here is what we did: Requirements: figure 1. First bends figure 2. After clean up. 3 pieces of square steel tubing 2 of them about 1 foot, the other maybe about 2 feet. Optional 2 1/2"x20 blots about 3" long and nuts. Large deep through vice. Muscle Deme ...
Back to Analog Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   I still have work to do on my Kelvin (4-wire) Milliohm Meter project, one item of which is to improve the accuracy of the meter when measuring below 3 milliohms.  I suspect the problem may be that the instrument amp is too close to the ground rail.  To correct this I ordered a LM2662 which is a C ...
dougw

Tube Amp on a PCB

Posted by dougw Top Member Nov 26, 2018
Back to Analog Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   Long, long ago in a far away place outside of the box, I was challenged to build a tube amp to explore the sound of tubes clipping. The idea was to make a tube amp that could clip at low volume so we didn't have to wake up the neighborhood to explore what what various amounts of clipping sounded like. I wa ...
Back to Analog Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   Well, Christmas or Hanukkah came early this year! These parts are what I call almost unobtainium! I wish to thank Tariq and the E-14 family for this dotation. Whoopie! Now to just get this thing built and tested. Fins!   Back to the Monthly Index ...
Back to Analog Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   As you all know I have been stripping a SONY Cassette Player/Recorder TC-188SD. After stripping I still have tons of room to stuff my 3 toroids,  power supply, 6 relays, Caps, 4x 12AX7, in nice colored shields, a TI MSP430 for control, and a partridge in the pear tree.  I had some four-inch wide ...
Back to Analog Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   Well, at last, I found my donor, a SONY TC-188SD Cassette Player. The cassette door will be clear plexiglass so can see the tubes glow. If I can get the parts, I will have a rather unique power supply that you only see in very exotic stuff. There are three transformers 1 for the heaters with dual 12vac o ...
phoenixcomm

RIAA Pre Amp

Posted by phoenixcomm Top Member Nov 5, 2018
Times are a changing! I just ordered 4 ciramic tube sockets and 4 shield sets ( two in blue, and two in red ). I was asked why the two colors? "Because I can." Was my answer hey right and left chanels. I have a older Sony cassette player, I think it will hold all of the crap, and the hole where transport door is, I will mount a little plexeglass, nice to see the things glow. But an led will help. My biggest setback are tubes 12AX7 (about $20.00 each, and the transformer (smallish) with 12vac at ...
Back to Analog Enter Your Electronics & Design Project for a chance to win a $100 Shopping Cart! Back to The Project14 homepage Project14 Home Monthly Themes Monthly Theme Poll   The basic idea was to create simple circuit with usage transistors, 4000 and 74HC series integrated circuits. I have created 3 bit random number generator with graphical presentation. Below there is logic circuit of this PRNG: We have here 3 bit shift register which input is feed from XOR gate which i ...