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  1. HarryA1

    Hall Sensor Bypass for Coffee Grinder

    I think it would be a worth while experiment to increase the current flow in the motor circuit by say  200ma. From the next to the bottom table above that would push it above the 200 ma minimum for mild coffee but not put into the 800ma maximum. One would need to find the motor voltage in order...
  2. HarryA1

    Hall Sensor Bypass for Coffee Grinder

    I gather the machine has  a fixed number of pulses it expects for each type of brew. It counts these via the two magnets. It also monitors the current draw by the motor. If the motor current drops off (no longer grinding) while it has not reach its count of rotations it "thinks" it is out of...
  3. HarryA1

    Fridge Protection

    There are devices similar to what you want on the market. This one has 5 minute delay. Perhaps if you poke around on ebay or amazon you could find a 10 minute one. https://www.ebay.com/itm/293677138457?_trkparms=amclksrc%3DITM%26aid%3D1110006%26algo%3DHOMESPLICE.SIM Else if you want to roll...
  4. HarryA1

    Project For Power Consumption Parameters Display on OLED

    Are you looking to emulate one of these?  https://www.amazon.com/s?k=measure+appliance+energy+use+with+a+plug-in+power+meter&crid=3QLC3ECDYF6C1&sprefix  You asked this question July 8 on eepower.com and never folowed up on their question to you. Are working for pcbway.com ?
  5. HarryA1

    Electronics Lab from 2007

    From back in the old days: https://web.archive.org/web/20070926045222/http://www.electronics-lab.com/forum/index.php
  6. HarryA1

    APD High Voltage Bias Solutions

    That is not much information to go by. Perhaps you could use a MC1455/555 as a monostable  employed as a switch; it has a rise time of 100ns. Plus a ZVNL120A N-CHANNEL ENHANCEMENT MODE VERTICAL DMOS FET it is good to 200v. It has a rise time of 8ns.
  7. HarryA1

    Electronic flourescent tube starter

    I am confused with the two SIDACs (Silicon Diode for Alternating Current) in series. They are rated 220-250 volts switching each. 240 mains voltages would be in the order of 340*1,4 or 480 volts  peak. About the same as the two SIDACs; not much to switch with? "These tasks of the starter are...
  8. HarryA1

    need help electronic/relay problem phone horn

    Search on the internet for "need help electronic/relay problem phone horn". As he posted this on 5 or 6 other forums you may find useful information there.
  9. HarryA1

    DIY Mini 12v Router UPS malfunction

    Your BMS (HW-391): Product Model: HW-391 Charging Voltage: DC 8.4-9V Version: Balance Constant Discharge Current: Max 20A (If the heat dissipation environment is not good, please reduce the use of load current) Constant charging current: Max 10A)...
  10. HarryA1

    DIY Mini 12v Router UPS malfunction

    If you use a 12v and 3 ampere charger that would require a little over 36 watts. A 12v and 1 ampere charger would be about 12+ watts. That would be less load on the power supply. Assuming the power supply is the limiting factor here. The slower charge rate would not be a problem if you do not...
  11. HarryA1

    DIY Mini 12v Router UPS malfunction

    If you do not see the 8.4 volts at the 5v to 12v converter it suggest that the power supply has gone into  a thermal overload state. Perhaps due to the drain from the charger. Switching it off resets it perhaps.
  12. HarryA1

    Measuring circuit current

    The meter  needs calibration. My AstroAl M2KOR has for DC current: accuracy +/- ( 1.2% rdg + 5 dgts). Whatever that means.  Also "when large currents are measured the  continuous measurement should not exceed 15 seconds".
  13. HarryA1

    Measuring circuit current

    My old Scope multimeter has a 0.01 ohm shunt resistor in the 10 ampere circuit going by the schematic. That is not much of an intrusion  into a  circuit.  I would think the analog meter is most likely the most accurate meter in your case. What does the clamp on meter give you? Knowing the on...
  14. HarryA1

    control circuit for solar panel tracker

    This is easier to do today with microcontollers like the Arduino UNO for example. Else you can  fabricate it from logic circuits using a number of timers like the MC1455 (a newer NE555).  I  can help you with either approach but recommend the microcontroller. If you are not familiar with them it...
  15. HarryA1

    triac firing using pnp transistor

    "none of those circuits are the one I posted with the pnp transistor connected to the gate. " How about this one?  With thanks to homemade-circuits.com  In LTspice simulation all I ever get is the TRIAC off or fully on. As there is  no phase control,  because there is no relationship between...
  16. HarryA1

    triac firing using pnp transistor

    See figure 5 here for similar circuit: https://www.homemade-circuits.com/simple-triac-triggering-circuits-explained/
  17. HarryA1

    triac firing using pnp transistor

    You are starting with a very primitive circuit. There are many complete TRIAC circuits to be had via internet search. LTspice does not have a TRIAC model because Analog does not manufacture them. If you search on TRIAC on Youtube.com you  will find numerous videos on the subject. This one has...
  18. HarryA1

    programming the atmega 328p microcontroller previous article on this subject

    There are numerous videos on Youtube on uploading to the Atmega328. This video has three ways to up load to the Atmegs328. Two methods use a UNO and one using  the FTDI. The second method using the UNO gives one insight into how the loading process works...
  19. HarryA1

    programming the atmega 328p microcontroller previous article on this subject

    It is not clear to me what you are trying to do. You say  " I have been using the nano board for a long time now ".  So you must have loaded programs into it? The Nano uses the ATmega328 the same AVR as the Uno. "Tried picking Uno board in tools menu".  ?   The Nano board is listed in the list...
  20. HarryA1

    AT89C51 datasheet

    https://components101.com/sites/default/files/component_datasheet/AT89C51.pdf
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