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I'm trying to create a univibe tyoe of guitar effect. That will consist of a timebase i.c. that will vary the sound to create a tremelo effect and various other phasing sounds. (Variable speed 1 to 30Hz)
The trouble is I can't get it past the breadboard, although it works well enough I cannot...
It's the other way round, I want to increase the value of the emitter resistor but I'm just concerned that none of the typical examples use a higher value. So, I'm wondering if there's a reason for that.
I'm in the process of making colpitts oscillators as part of a theremin project. The question I have is this, why do most example circuits (bjt) have a low value emitter resistor in the range of 470r to 2.2k? Is it for stability, low drift, precision etc. or is it overkill.
I'm committed to 9v...
I have a pickit 2 with 16f690, and now I've just got some 16f877's and 16f876's, I would like to know if the programmer is going to suffice, rather than buy a new programmer. Obviously the demo board is redundant. The programmer has a 6 pin header which seems standard, but if I rig up a...
I have a power supply hacked from a Kenwood 5 channel home cinema system. It gives 117v dc from the rectifier. What I would like is a 5 to 30v adjustable power supply and don't quite know which way to go about it. Is it worth the trouble to adapt the kenwood? I have made a 5 to 12v supply but...
It was the v1 and v2 variables that were incorrectly declared. now the code works fine, strange how it compiled without warnings. Thanks anyway because the code examples were excellent.
pickit 2/ 16f690/ mplab ide
I'm having trouble with loops now that I'm trying to write my own code, I want to use decfsz because it doesn't reset any flags, all they examples I see use f as destination but I can only get the loops to function with w as the destination or a mixture of f and w in...
I have built a small amplifier based on actual designs suggested by the datasheet of the TDA 2004 (8 watt stereo). This works fine with my guitar effects pedals, It's surprisingly loud, clear and with little distortion.
I then built a stereo preamplifier based on the TLA071 opamp, again with a...
The speaker was the problem. I just needed to establish the device was operational before I proceeded. Thanks.
Added after 2 minutes:
I intend to continue trying meaningless stuff, it's a good way of learning. Thanks anyway.
There's some gain if I disconnect the input and touch pin 3 I get a buzz, but as soon as I earth the input there's nothing. I've got a small speaker attached. Thanks anyway.
TL071 Op Amp problems
Anyone know how to wire this up?
All I seem to get is a faint crackle as an output, maybe I'm expecting too much.
I've got 12v going to pin 7, output from pin 6, input to pin 3, ground to pin 4.
I have resolved the issue by using RA3 and RA4 with 2 resistors (5.6k) to Vss, the pendulum works almost perfectly (it's a bit jerky). I still don't understand why RA1 and RA2 behave so differently but reading the documentation it's obvious they are different.
I have put a 3 second delay on...
Well let me explain what I'm trying to do, I'm trying to build a verticle pendulum and the motor needs to drive when the pendulum starts to fall. so the inputs are to sense the pendulum movement. I realize I need to tie down the inputs but I also need RA1 and RA2 to behave identically or I will...
programmer 16f690
Thanks for the information because it can take days to plough through all the documentation.
When connected to the programmer via usb, everything goes swimmingly, but when I connect to an outside voltage source, the pic board goes instable and some pins start oscillating and...
pic16f690 setup ports
I'm having a problem programming the 16f690, I need 2 inputs on porta and only RA1 is behaving correctly. The problem occurs if I configure RA2 or any other pin as input. The pin senses input OK, but keeps sensing input for another 2 or 3 seconds, in other words it doesn't...
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