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  1. bertus

    The Latest Build

    Hello, @VenomBallistics , do you mean this schematic: Extracted from the .ps file. Bertus
  2. bertus

    The Latest Build

    Hello, The VT999 is mentioned on this forum: https://www.freestompboxes.org/viewtopic.php?t=1140 Keep in mind that tubes do have heaters that need some power. In the VT999 the 12AX7 / ECC83 is used: https://en.wikipedia.org/wiki/12AX7 And tubes are not cheap these days...
  3. bertus

    Overheating resistors in guitar amp

    Hello, As regulators, you could also use a LM317 tracking regulator for the positive side: The adjust to ground resistor should be 1500 Ohms for 16.8 Volts output. For the negative side, you could mirror the circuit using LM337 regulators. You should use this configuration as the input...
  4. bertus

    Why is my LM317 current limiter circuit not working?

    Hello, As @crutschow said, check the pins of the LM317: It looks like you changed Vin and ADJ. Also have a look at the used wires. They are stranded wires, wich can split and cause shorts. For a beadboard, you can better use solid core wires. Bertus
  5. bertus

    Kenwood DNX691HD Head Unit Daughter Board Component ID Help

    Hello, The images are not visible. As moderator I can see the source. The images are the same: Bertus
  6. bertus

    Why is my LM317 current limiter circuit not working?

    Hello, Is this the set-up you are using? I assume R1 is 12.5 Ohms and VR1 is a 2 kOhm pot set to 41 Ohms. The current will be about 1.25 V / (12.5 + 41)Ohm = 23.4 mA The maximum output resitor will be (19.5-3-1.25) V / 23.4 mA = 651 Ohms. The power developed in the output resistor will be...
  7. bertus

    Help with finding equivalent Operational Amplifier from AD converter

    Hello, The C812C is the partnumber. The other code is likely a production date/number. That can vary for each batch produced. Bertus
  8. bertus

    Boxed In- why doesn't it work when in the box

    Hello, Does the capacitor have long legs? Then you could possibly mount it on its side: Bertus
  9. bertus

    Boxed In- why doesn't it work when in the box

    Hello, You could use some isolation between the box and PCB. You could use the plastic sheets that you can find in the supermarket between the pre-packed meat and cheese. (they will cost you nothing). Bertus
  10. bertus

    Power Supply

    Hello, Late Tony van Roon made a benchtop power supply using the LM723. In the schematic yoy will see wich components vary the voltage. Bertus
  11. bertus

    Back to the Breadboard

    Hello, This box would give you some more space...
  12. bertus

    Back to the Breadboard

    Hello, Perhaps a battery holder like this might work: https://www.railwayscenics.com/pp3-panel-mount-battery-holder-p-3182.html Here is a similar one at amazon...
  13. bertus

    Fixing an old car century battery charger

    Hello, As @Harald Kapp said, the pins have symbols next to them. ( I see them printed on the side of the rectifier ). The ~ pins are in inputs from the transformer. The + pin is the positive output. The - pin is not used. Bertus
  14. bertus

    Back to the Breadboard

    I think you made a typo: 104 is 100nF which is 0.1uF. Bertus
  15. bertus

    Back to the Breadboard

    Hello, The 103 decodes to 1 0 000 = 10000 pF = 10 nF Read this page for the capacitor codes: http://www.pronine.ca/capmark.htm Moer interesting links are here: http://www.pronine.ca/links.htm Bertus
  16. bertus

    Op Amp Substitute?

    Hello, Here you can download a zipfile with a lot of audio related circuits: https://the-eye.eu/public/murdercube.com/Electronics/Electronics/Electronic%20Schematics%20Audio%20Devices.zip There is also a theremin in there. Bertus
  17. bertus

    Anyone know what this little device is?

    Hello, Have a look at these pages how to resize an image: https://www.businessinsider.com/how-to-resize-an-image-on-iphone?international=true&r=US&IR=T https://www.howtogeek.com/726913/how-to-resize-or-reduce-photo-size-on-iphone-and-ipad/ Bertus
  18. bertus

    Anyone know what this little device is?

    Hello, Keep the size of pictures below 300 kB to upload. Bertus
  19. bertus

    Fixing an old car century battery charger

    Hello, If you want to have a similar arangement as in the old situation, use half the bridge: Bertus
  20. bertus

    Op Amp Substitute?

    Hello, The 4093 is a quad schmitt trigger chip. The 4094 is a shift register. Have a look at the cmos logic databook: http://www.cambot.net/DATA/DATABOOK/CMOS.pdf Bertus
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