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  1. bertus

    Help Identifying a Component

    Hello, Looking at the schematic, it is a feedback resistor. The value of 390k suggested by @ChosunOne could well be correct. Bertus
  2. bertus

    Need someone to look over my circuit

    Hello, If the buzzer is really a FST4020, you will likely never hear it. The coil resistance is about 17 Ohms, so there will be no voltage on the buzzer left. The datasheet shows this circuit for driving the buzzer: Bertus
  3. bertus

    Handholding request

    Hello, Under the tape there should be cover. The low voltage side shows 3 scews under that cover: On the cover the voltages are given: You need to find out if the chime is working on 8 or 12 Volts. Bertus
  4. bertus

    Much Help needed with 8251 USART Problem.......

    Hello, Thanks for the link. It might also help others with the same problem. Bertus
  5. bertus

    Much Help needed with 8251 USART Problem.......

    Hello, What is the speed you are using? This page tells me that asynchronous mode the speed is lower as 20 Kbits/s : https://www.eeeguide.com/serial-communication-interface-8251/ Bertus
  6. bertus

    CTX-3030 Metal Detector Battery Fault - BQ20Z70

    Hello, There seem to be several versions of the BQ device: http://www.datasheetdir.com/BQ20Z75-V180+Battery-Fuel-Gauges Did you get the correct version? Bertus
  7. bertus

    Need Help with simple 9V circuit design.

    Hello, You can get a LP2950 in a TO-92 housing. It has the following connections: Bertus
  8. bertus

    Why do I not get e-mails about replies to threads I am involved in here?

    Hello, Are the mails not in the spambox? If not,then it is perhaps time for @eerob to have a look at the email system. Bertus
  9. bertus

    Need Help with simple 9V circuit design.

    Hello, On the page that @Nanren888 gave, in the specifications is given that the output is TTL logic. You will need more parts to drive the motor. Also the PCB can not run on 9 Volts. Bertus
  10. bertus

    Question hdd badblock interference and dvd burn

    Hello, Once I had a drive with SMART capability. It was about to fail and at startup of the system I got the message: immediately make backups and replace the harddisk. Bertus
  11. bertus

    My Li-Ion Battery Charger Circuit Is Not Working As Expected

    Hello, One of the first hits on google images for a li-ion charger with the LM317 is the following link: http://danyk.cz/li-ion_en.html Bertus
  12. bertus

    electrical delay line attempt

    Hello, In old PAL color tv's there where also delay lines. One long one of 450 nS ans a little block for 64 μS. The wiki shows them: https://en.wikipedia.org/wiki/Analog_delay_line Bertus
  13. bertus

    Question hdd badblock interference and dvd burn

    Hello, Did you read post #5 ? Bertus
  14. bertus

    Why do I not get e-mails about replies to threads I am involved in here?

    Hello, Do you have the notifications ticked on the preferences page: I have them off, as I don't want to have any notifications. Bertus
  15. bertus

    Question hdd badblock interference and dvd burn

    Hello, Here I have more info on the S.M.A.R.T. monitoring tool (Self-Monitoring, Analysis and Reporting Technology System): https://sourceforge.net/projects/smartmontools/ https://www.smartmontools.org/ Bertus
  16. bertus

    Doubts electrolytic capacitors

    Hello, From the Capsite: Parts kept in long-term storage (2-3 years or more) may have very high leakage when first used and should not be subjected to full rated voltage (and should be current limited) until the leakage falls to normal. Reforming of the dielectric can be done by applying a...
  17. bertus

    Comedy Thread

    Found at AAC again:
  18. bertus

    Curtis rcd628 CD Player won’t read

    Hello, Perhaps you can find some tips on this page: http://www.repairfaq.org/sam/cdfaq.htm Bertus
  19. bertus

    tantalus capacitor doubt

    Hello, You can read about the properties of tantalium capacitors on the Capsite: http://www.iequalscdvdt.com/tantalum_and_niobium.html More info can be found in the menu on the left. Bertus
  20. bertus

    Question SSD china aliexpress

    Hello, You can have them from $60 to $150 from amazon...
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