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  1. dorke

    Building AEON overdrive pedal from mammoth electronics, need help...

    I found this assembly instructions. You should use wires to connect these: in =input jack out =output jack S4-S6 = switch connections. GAIN = 500K Tone = 5K Vol = 100K Direct connection : D5 = dual color LED connections. Hope that helps. BTW, If they charge 55$ for that thing, it's an...
  2. dorke

    Building AEON overdrive pedal from mammoth electronics, need help...

    Yes, pictures are essential ! And more important: If you have a circuit diagram and/or building instruction post them as well.
  3. dorke

    back for now: PWM + Serial (single wire)

    I was under the impression that a VFD-Motor system looks like in the pic below. The VFD controls the motor via the PWM "link". And the User "communicates" with the VFD via "RS-485 link". The RS-485 is a standard serial async protocol. You can also find per-made software for the "userinterface"...
  4. dorke

    Precision Rectifier

    Try this: Split R7 into a 7.5K fixed resistor in series with a 5K potentiometer(other combinations are also possible to get at least 10k +/- 2k.) That will allow you to balance the gain of the two half cycles.
  5. dorke

    Create an UP-DOWN pulse from a single UP to DOWN signal

    Yes Kid,you are correct.
  6. dorke

    Sansui SP-2500 Speaker Crossover Repair

    I think your problems are elsewhere. Look at the switches, they are "dirty to the bone" and need argent good clean-up. Use deoxit or similar stuff for cleaning. Only after cleaning, you should consider replacing the caps. If you do need to, you should replace them with non-polarized...
  7. dorke

    Create an UP-DOWN pulse from a single UP to DOWN signal

    1. As far as I know, there is no such part 40218 you, probably mean 4028. 2. The way you implement this is very cumbersome! a single 4017 (10bit ring counter) can replace the 4510+4028. 3. For much more freedom with the light chasing patterns use a universal shift register. You can use the...
  8. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Another pair of resistors that needs checking-near the white TLP251s.
  9. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Now it is time to check the DC voltages on CN13 and CN14 directly. 1. You should get 0V on both regardless of the 4,6 jumper in or out Is that so? (Carful ! there is voltage on the pins but the difference is 0) 2. Now use jumper 4, Add to it a jumper (to 5v) to click the corresponding UP relay...
  10. dorke

    Help! Repairing water damaged PCB from Massage chair.

    If you have 220 and 100 use them in series instead of the 330. Is that the value of item 1 resistors in #241 ?
  11. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Hi Jonatan, There seems to be a problem with the " forum alerts",I didn't see any.so I checked the thread directly. To our board... 1. There is another pair of resistors with suspicious values,near the MOCs. The Photo is not completely clear(see below), what I see is 120K [brown...
  12. dorke

    Power Supply with an output of 12V using Silicon Controlled Rectifier?

    And it should break ! You have V221=220Vrms connected through the "fired SCRs" to the load of R14=0.24ohm and the fuse is 1A. Try to calculate the current you get through the fuse...:rolleyes: Besides, What is it you wish to do ,and why do you need the SCRs for?
  13. dorke

    Problems Programming PICKIT 2 Clone

    Have you accidentally turned on the "Code-Protect" feature?
  14. dorke

    Looking for < $5 daisy-chainable ADC

    Is I2C an option? Can make life easier with multiple devices.
  15. dorke

    Precision Rectifier

    "Accuracy of 10K resistance is vary about 5%..." That is not good enough you should go below 1%, if possible even 0.1%. In your simulation you can verify the bad distortion effects of 5% resistors. Create the worst unmatched situation with R4-R7 values. min- 9500 ohm max- 10500 ohm In...
  16. dorke

    Looking for < $5 daisy-chainable ADC

    You left out the most important parameter :( What is the resolution you need?
  17. dorke

    Precision Rectifier

    I would like to add: Your simulation diagram shows the power connections to the op. amps to be a dual power supply. Is that the same in the circuit you actually build,or are you using a single power supply there? What are the actual voltage values of the power supplies measured on the op.amps...
  18. dorke

    Need help with my first DIY project

    Yes that DROK will do the same .It is adjustable only to 15V(otherwise is probably almost the same inside). No need to go for 24V(which will also at some point drop,say cloudy day or night time etc.). If the solar panel voltage will drop to less than 3v above the output the DROK is set to...
  19. dorke

    Make a relay switch? Like a mosfet high amp.

    The main reason an SCR isn't a choice is it will drop about 1.5V of the battery's 3.7V... nor is a Darlington one from the same reason . We won't even get to the power dissipation issue ;) The way to go is with a low RDS-on power Mosfet like the BSC009NE2LS5I RDSonMAX(@VGS=4.5V) is 0.00135...
  20. dorke

    Help! Repairing water damaged PCB from Massage chair.

    Let's see : With no jumpers in the IC socket we get 1. DCV between pin 1 and 2 of the MOC about 0V. 2. ACV on the resistors of about 0v With the jumpers in the IC socket we get 3. DCV between pin 1 and 2 of the MOC about 1.6V. 4. ACV on the resistors of about 9V to 49V. 5. At all...
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