He's using it for driving active low PNP switched relay modules Then it's just the question of checking and mitigating a probably pulse spike then
Mmm but would it help mitigate the problem? I'm not sure about 74HC595 but I don't think they can sink current reliably So anyway, most likely it's a low-side PNP transistor switch which requires active low to activate Should I get a buffer, some transistors between the relays and hex shifter? Sorry, so when the inputs are unplugged, relays are off. I put the relay inputs to ground, they turn on. presumably fed from RPI ?įed from the 5v psu, with heaps of caps on there to filter + 1000uf cap + diode to prevent brownoutsįirst of all, then, is I advice you put a buffer between the shift register and the relay moduleĪlso, are you sure the relay module input is active low ? You're rippling 6-bit parallel out to the relay module from the shift register. I'm still not seeing how it's all connected so I can't say for sureįor example, this.16 pin thing is a. but the glitch toggle is probably just ringing might want to see the trigger pulse for your relay module I can get hold of one of these in a couple hours from now though: ƬTION ignores gate capacitance (for the most part) MOSFET is the state approved manufacturer of FETs in Russia. just regular transistor driving relay coil with a flyback diode clamp a resistor, diode and led for each relay along with a resitor for each. I can see a 3pin what looks like transistor. Streaker: Actually, discrete mosfets are a good example of what can happen to tiny capacitors with weak dielectric in them it might not have internal debouncing so you might need to debounce your on/off signals etc Streaker: I'd be more worried about discrete mosfets :/ but yeah I got given it so I don't know the details. Googling now trying to find the exact one. LuminaxWk: I'm not too sure on the circuit diagram, a picture may be of limited help? I don't know the exact spec. So, if you have 10kV on you, and touch a 10nF cap, you induce a charge of 100V I wrote it close to how I have it laid out on the prototyping board. Streaker: Charge on the human body model is ~100pF or so. Streaker: Run the human body model in spice and see what happens :) Got me wondering if it's a significant concern. Sorry to say but your drawing looks more like a block diagram than a schematic TTN : would be helpful if we know what and how the relay module looks like, how the 'on/off' signal were being handled by the relay etc etc TTN: Sorry, my sigh was unrelated to your work. Streaker: If one end were properly grounded? I suppose it's possible.Īnd I may be one/look like one of them. I'd wager that you've seen lots of people come along, ask questions, where the answer is really just a matter of them doing some reading/research. sometimes ( 5v converter on there but have taken it off for the tiem being.īall: well, you're sighing.
I have a device with a microchip pic24f mcu and a microchip spi eeprom.
Sainsmart dds140 linux series#
Mabye the compressor winding provides a series power limiting or something
Sainsmart dds140 linux portable#
There must be something that I can not understand to how these portable ac fan motors work Despite all my cursing I haven't owned a proper oscilloscope for years, I can't justify the space nor the money for the amount of use - something is better than nothing.ƬTION grinds harwiltz against the news story Its a bit difficult for me because during my employed life I had access to whatever equipment I needed (bliss!) so what I could do near instantaneously what is a chore on a head unit and so I am a bit over-critical and old age hasn't made me more patientīasically, don't expect wonders and you will have a functional piece of kit but if you expect to use it a lot you might as well invest in a self-contained unit now rather than later - but of course that is at a completely different price level. The other thing that is a pain is not having physical controls, using a separate computer and mouse to operate the control panel is both tiring and distracting if you are doing a lot of changes - I was doing some analogue work recently. For regular signals this is not a problem, it displays a nice regular signal, but for irregular signals its useless unless you have a suitable trigger for what you need. The big problem with a lot of these head units is that they don't capture/pass data continuously, they capture data, stop capturing, transfer, start capturing again and repeat. These days I use an old Sainsmart DDS140 and it is a pain-in-the-neck. I used pico stuff when it was new and state-of-the-art, at the time it was excellent because it was novel and comparatively very cheap.
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