Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
Looks like the AD9833 DDS might be a good solution. It has the required outputs and you can use e.g. analog switches to select which to use. You can buy it from e.g. Banggood mounted on a sub-board and only need to connect power and signals...
The UART serializes the byte to send and takes care of the timing and preamble/postamble. The MAX232 or similar receives the TTL level signals and passes it on as RS-232 level signals and vice-versa.
If what you want is to have two MCUs communicating in the same circuit you can dispense with...
Mine uses 5V on the filament and 12V on the grids and segments. It's a 12 digit display from an old calculator. The glow is beautiful, I really must find some application for it.
To find the filament measure between all pins in sequence until you find a pair with a fairly low resistance...
The gate resistor is not so much for current limiting than for stopping parasitic oscillations. The parasitic inductances on and surrounding the chip in conjunction with the gate capacitance makes it 'sing' somewhere in the VHF-UHF band. The resistor reduces the Q value of the circuit, thus...
R5, C1 and C6 are there to filter out any noise from the supply line. C6 is needed because elcos aren't very good at RF. The purpose of C6 is to ground the RF currents in the tank circuit, necessary for the feedback that makes the circuit oscillate.
If you don't want to make a tap in the tank...
2 ways.
1 - Remove the connection from the wiper to the base. Measure the voltage between ground and the wiper while you turn the pot. The voltage should vary between 0 and 9 volts.
2 - Ohm it between the extremities. This should give the value marked on it +/- some percentage. If that's ok...
Sorry if I sound grumpy, but your request is far too broad. Decide what you really want, range, amplitude, impedance, etc. Then use a search engine to find a reference design and take it from there. You may get help with some detail, but you should do the end design and work on it.
Possibly it's "squegging". That is when the oscillations build up very rapidly and there is gate rectification, driving it negative enough to stop oscillations. The gate resistor now discharges the capacitors until it oscillates again and the cycle repeats. Try reducing the gate resistor, the...
Try this. Lay a piece of bare wire along the cable where it goes above the circuit. Wrap the cable and wire with aluminium foil along the same length. Ground the other end of the wire. Be careful not to get too close to any exposed power terminals. If needed wrap some insulating tape over the...
If it works with one bell but not with two, the problem is that inductive kick-back from the contacts when opening is somehow getting back into the circuit. Check wiring and layout, keep the power wiring well separated from logic supply and signals.
Put a snubber across the contacts. I suppose...
Expect to spend a lot on R&D. Also expect to spend a lot if you go with Siemens PLC.
If you're doing it for the learning experience then go with whatever you fancy. If you're planning to actually control something then go with a Click PLC from AutomationDirect...
VFDs are used wherever machine speed control is wanted. They're especially popular in flow control, adjusting pump speed, rather than using a fixed speed pump and choking flow with a valve. Also conveyors transporting product at whatever rate the process can handle.
The gas centrifuge case is...
What you describe is the common emitter case, and is correct. But in this case the transistors are emitter followers. So the emitters go to whatever voltage the 555/100R combo permits, leaving quite a bit of Vce for the transistors to dissipate. I do suspect there's not all that much current so...
Just one of the first searching for "permanent magnet motors":
https://www.ohioelectricmotors.com/our-products/permanent-magnet-motors/
This one gives a bit more:
**broken link removed**
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
