wine packed up and left, now to upgrade or downgrade? try upgrade first...

 

wine packed up and left, now to upgrade or downgrade? try upgrade first...

140mb download on 1/2 of 1mb line (other download), gonna take 40min - 1h, gonna boot my Win7 virtual machine now run LTspice in real windoze

 

ok now what, I've got a grey screen with black cross, *new schematic* shows Draft1, Draft2

 

ok now what, I've got a grey screen with black cross, *new schematic* shows Draft1, Draft2

I still have to build the circuit suggested by #12, I'll do that later today.
In the meantime, I suggest you explore the examples and tutorials included with LTspice

 

In my machine, those samples are located in "C:\Program Files\LTC\LTspiceIV\examples"

 

Open one of them, and run the sim by pressing the running man button on top left of the menu.
Then place a probe at any node of the circuit to see what happens.

 

OK, my TinyCAD can generate SPICE netlist... protel is the one I use for VeeCAD initialization

 

For instance, there's a file named astable.asc, open that one, run it and place the probe in several places... see what happens..

 

Another very interesting file is 160.asc
just run it and it'll automatically show you what's happening

 

Open one of them, and run the sim by pressing the running man button on top left of the menu.
Then place a probe at any node of the circuit to see what happens.

Oh S*T I've got a lot to learn

 

Thanks Ian... I've been searching everywhere for a sample of a 555 circuit that ramps up and holds a voltage... got any ideas?

Sounds like you want the monostable configuration - it ramps one way or the other, then stops till it gets another trig.

 

Another very interesting file is 160.asc
just run it and it'll automatically show you what's happening

Absolutely beautiful, was thinking of investing in a oscilloscope, but that will eat most all of my savings, I've got about 3000 ZAR saved up for when I need to buy R30 a piece jfets, I'm very careful with my money, I might really need it, for if my motherboard acts up or something... not your worries

 

Sounds like you want the monostable configuration - it ramps one way or the other, then stops till it gets another trig.

NOPE, that's what cmartinez thought aswell: time x axis; brightness y axis



both slopes should be adjustable indepentantly, and the distance between led1 (blue) and led2 (red) starting time should be adjustable, so led 1 starts lighting up and a (adjustable) moment later led 2 starts lighting up, both at their own speed

 

excuse the fact that I'm still very noob, but what part of the circuit is that, and how does it work, I don't see the diodes working? does this circuit fade the diodes? how will base be controlled by the resistor and potentiometer? should this be obvious?

The normal astable has a top resistor from pin 7 to Vcc, that limits the collector current when the Disch' transistor is conducting.

The next resistor between pin 7 and 2-6 is the timing resistor, when the timing capacitor is charging the current is flowing from Vcc to charge the capacitor. In the other phase of the astable, the Disch transistor conducts and the current discharging the capacitor flows in the opposite direction.

Clearly; you can use a pair of steering diodes to separate the charge and discharge paths - then you can have 2 different resistors, one for charge and one for discharge, from that point on its easy to manipulate the relative charge and discharge time periods.

Just replace the 2 resistors with a single pot and you can sweep the common point to favour one diode or the other.

 

The normal astable has a top resistor from pin 7 to Vcc, that limits the collector current when the Disch' transistor is conducting.

The next resistor between pin 7 and 2-6 is the timing resistor, when the timing capacitor is charging the current is flowing from Vcc to charge the capacitor. In the other phase of the astable, the Disch transistor conducts and the current discharging the capacitor flows in the opposite direction.

Clearly; you can use a pair of steering diodes to separate the charge and discharge paths - then you can have 2 different resistors, one for charge and one for discharge, from that point on its easy to manipulate the relative charge and discharge time periods.

Just replace the 2 resistors with a single pot and you can sweep the common point to favour one diode or the other.

OK, have no idea what you just said, but in the end I can't use a pot (can use it to determine what the set value should be), but I'm making 8 different keys of fart sounds, it should in the end be as simple as pressing the (available SPDT) buttons/keys

 

Sounds like you want the monostable configuration - it ramps one way or the other, then stops till it gets another trig.

Yes, that's what I want... and I've seen monostable configurations, but not one that behaves the way I want. That is, press the trigger, ramp the voltage up, and stay at maximum voltage until the trigger button is released.

 

Yes, that's what I want... and I've seen monostable configurations, but not one that behaves the way I want. That is, press the trigger, ramp the voltage up, and stay at maximum voltage until the trigger button is released.

sorry, misunderstood... mono is 1 so ofcourse monostable and yes, none I've seen either does what we need

 

NOPE, that's what cmartinez thought aswell: time x axis; brightness y axis

View attachment 82928

both slopes should be adjustable indepentantly, and the distance between led1 (blue) and led2 (red) starting time should be adjustable, so led 1 starts lighting up and a (adjustable) moment later led 2 starts lighting up, both at their own speed

Chillum, generating the ramp and discharging on release is the tricky part. Triggering the second led with an adjustable delay will be a piece of cake after that.

 

LTspice rules, I don't need an oscilloscope anymore

 

Chillum, generating the ramp and discharging on release is the tricky part. Triggering the second led with an adjustable delay will be a piece of cake after that.

I thought that it should be simple to do the delay, my guess was a simple capacitor to reset?