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  1. bertus

    Solid State Solution for Fried Autotransformer

    Hello, Take a look at your schematic. What would happen when the 25 Volts output gets shorted? As the LM338 allows a maximum differential of 40 Volts, it will likely blow. Bertus
  2. bertus

    Nmea 0183 gps

    Hello, What is the exact model of the gps? There are many : https://avmap.it/us/ Bertus
  3. bertus

    Nmea 0183 gps

    Hello, Does this tell you more: https://support.garmin.com/en-US/?faq=0kbB2KplF656T5IIpUc4W8 And the attached PDF. Bertus
  4. bertus

    Best Supplier for Surface Mount adapter boards

    Hello, Have a look at adafruit: https://www.adafruit.com/category/475 Bertus
  5. bertus

    Help me identify this component

    Hello, It is a dual schottky diode: https://eu.mouser.com/ProductDetail/Taiwan-Semiconductor/SR1640-C0?qs=dv9KMQQLqv2p7II%252BujpC3w%3D%3D Bertus
  6. bertus

    Gadet Geocache - lock not tripping

    Hello, @VenomBallistics , Should there not be a diode over the coil to protect the mosfet? Bertus
  7. bertus

    W04M RECTIFIER c

    Hello, The rectifier is 1.5 Amp @ 400 Volts. Any rectifier with that spec could do. You could also use 4 times 1N5404 diodes or higher. Bertus
  8. bertus

    Amplifer improvement advice please

    Hello, Did you have a look at your thread at AAC: Amplifier improvement advice please Bertus
  9. bertus

    The Latest Build

    Hello, @SparkyCal , These are more decent videos on soldering: Bertus
  10. bertus

    The Latest Build

    Hello, the following page will give you some tips on through hole soldering: https://www.mikroe.com/blog/through-hole-soldering Don´t let you be put off by the number of solderspots. I once made a board with 30 chips on it. Bertus
  11. bertus

    Whistle responder circuit

    Hello, You could try to make a tone detector using the LM567. Bertus
  12. bertus

    Possible short in Rad2X - RGB2HDMI

    Hello, Did you check the fuses F1 and F2 (marked bm on the pictures)? There is one on each side of the PCB. Bertus
  13. bertus

    Hello, Welcome! (Introduce yourself)

    Hello, @igbeserk , Welcome to the forum. You will find a lot of info in this section of the AAC site: https://www.allaboutcircuits.com/textbook/ Bertus
  14. bertus

    DC Motor Driver Problem

    Hello, Or it could be that the mosfets are not switched fast enough. The time a mosfet stays in the linear region causes the mosfet to heat-up. Also when mosfets are not driven all open (gate voltage to low) , heat will be the result. @endoramax , Does the board have a voltage regulator for...
  15. bertus

    Help me identifying 4pin Ic number

    Hello, The 4 pin devices could be PhotoMOS relays. Panasonic has a couple that will shows in the attached file. Bertus
  16. bertus

    The Latest Build

    Hello, @SparkyCal , Have a look at the theremax files on that manual page: https://paia.com/manuals-new It seems to be a quite reasonable theremin kit. https://paia.com/proddetail.php?prod=9505KC Bertus
  17. bertus

    The Latest Build

    Hello, @VenomBallistics , I see they have more manuals and even a forum: https://paia.com/manuals-new https://www.paia.com/talk/ Bertus
  18. bertus

    Amplifer improvement advice please

    Hello, I see that you have made changes to the origenal schematic. Can you post the origenal schematic? It looks like that this is the origenal circuit: https://hackaday.io/project/173235-2sa1943-silicon-pnp-power-transistor-utsource It can be that the biasing is not correct and causing...
  19. bertus

    The Latest Build

    Hello, @VenomBallistics , this is the other with a multiplier circuit: Bertus
  20. bertus

    The Latest Build

    Hello, The one with a voltage multiplier is this one: Bertus
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