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JoaMat

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JoaMat last won the day on April 21

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About JoaMat

  • Birthday 12/26/1955

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    Sweden
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  1. Next build – remove R1 ( don’t understand why I put it there – maybe because I’m an amateur) and R2 value is far too low, unless you want 40 mA through LED, so I switched to 1K. Small board 19mm x 15mm with the 555, a small PNP , three resistors and of course the bi color LED. Works perfect.
  2. Nightly build Red LED indicates disengaged headphone. The green LED indicates power is on. Here red is out and headphone is connected. Next build… …a bi-color LED to replace the two above LEDs.
  3. Headphone protector installed and working. Delay time is 15 seconds, and it disconnects when offset is more than approximately +/-70 mV.
  4. Thanks James, your schematics gives a clear picture how to switch to KSA1220 and KSC2690. Unfortunately, it seems that KSA1220 is out of business. Fortunately, TTA004 and TTC004 can replace KSA1220 respectively KSC2690.
  5. Kind of, mains in at blue tblock and and +/-24V out at the other corner. Can’t be easier.
  6. Just move the two right legs on step to the left and swing the left leg all the way to the right…
  7. SMPS300R , bought from Audiophonics - nice company, next day delivery from France to Sweden.
  8. My CFA3smd something, now powered from a switched mode power supply and equipped with a headphone protector. I’ll test this for a while and if I like it I might build a decent cage for it. Else I’ve a growing "good to have" closet.
  9. It’s soldered by hand. I’ve tried hot air, but I prefer a solder pen and tweezer - gives me better control I think.
  10. Seems to work. The red LED turns off and on correctly. Red light means everything is OK – off means something is bad. A green LED might be more appropriate. The short uninsulated wires, one each side, is not to correct a mistake. It was the only way I find to get it working. The board has 19 vias. I did one mistake though. I gave the mosfet driving the relay a wrong footprint, but fortunately it was possible improvise… now it works as it should. I’m waiting for the relay. Omron G6S-2G – surface mounted, good for 2 A.
  11. Popped up at Qobuz grand selection. I enjoyed it.
  12. Here is a rebuild Dynahi, now a CFA3 something. CFA3smd engraved on back side of the Dynahi front panel. A green LED in the small S. Diagram of bias (in mA for the first 40 minutes from power on) for servo respective no servo. I think that with the servo it’s possible to build this with just 4 transistors instead of 14 (per channel) on heat sink – time will tell.
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