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I'm not sure what your intended output is but the feedback and coupling paths are probably supposed to be RC networks but yours are missing the 'R's.
Placing 100uF capacitors as loads on any amplifier is asking fro trouble.
Brian.
It is in the FPGA forum.
I have never done it and I confess to not being an expert in FPGA design, the last I did was about 10 years ago!
However, my approach would be to (assuming it is on/off keying and not needing a tone decoder) make a long shift register, long enough to hold a bit for...
The DS1307 is basically an oscillator and a chain of digital dividers to convert the 32768Hz oscillations into seconds, minutes, hours and date. It is highly unlikely the digital dividers give wrong results but it is possible the oscillator part is not to original manufacturers specification and...
Please show the circuit.
From the voltages you quote, it looks more like Vgs is the gate voltage from ground instead of between gate and source. For full conduction the gate voltage has to be close to 36V above ground.
Brian.
You do realize that the scope probes themselves probably add more load capacitance than the physical capacitors and the scope measures frequency by timing between peaks of the waveform so will have a degree of inaccuracy and instability. You should check the frequency using the SQW output where...
Three points I notice straight away:
1. no decoupling capacitors across VSS & VDD on the breadboard. This WILL stop it working!
2. you have "RW=0" in your code twice but no "RW= 1", it may be that your LCD does not need RW but please check.
3. RV1 probably wants connecting across VSS and VDD...
Its an adapter so you can fit sockets for surface mounted ICs. Given the vintage of your MSX computer, it probably doesn't have any. Surface mounted ICs have either gull-wing legs (like normal pins but they sit flush to the board surface), J-legs which are like normal pins but curl under the...
If the code is good (we can't see it) and the hardware is good (we can't see it) your problem is probably the configuration bits. Simulators often ignore the bits but real life won't so that could be the difference.
Brian.
I'm no expert in this topic but I wonder if there is an overall advantage in setting a lower battery 'charge state' limit as long as it doesn't go below say 10%. Battery manufacturers give best lower limits for prolonged battery life but in a situation where they are charged and discharged...
...or if you can accept some frequency dependency, add a capacitor between R3 and ground. Without a negative supply the output can't drop below zero to provide the required negative feedback.
Brian.
Using 555s at all isn't a good solution but the fix for the over-voltage problem is to add a diode across the 10K pull-up resistors so it dumps excess to the supply rail.
Brian.
Got the email thanks.
Most UV LEDs radiate at about 395nM despite what the adverts say. Undoubtedly they will erase an EPROM but so will white light given long enough.
Ideally you want a UV source near 250nM, much shorter wavelength than a normal UV LED. They are available but at sky high...
Be careful with supply decoupling, NE555s pulse current at the Vin pin as they change state.
However, there is a potential design flaw repeated three times. Look at the 100nF capacitors at the output of the first, third and fourth ICs, when the output of the NE555 is low, they charge to 10V...
Now you know why I haven't touched Windows in years!
The port address problem is caused by Windows virtualization of the ports. In the old days a port, whether printer, serial or even USB was addressed by its real electrical port number, unfortunately for us, when multi tasking programs came...
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