Post Created date
Sound card output signal biasing ?
Thanks for all those reply's guys. Quote:1. With the DVM in DC Volt mode and with the PC volume control set to "0" measure the voltage between the "shield" of the extension cable...
Tuesday, 6 December 2011 - 18:23
Sound card output signal biasing ?
I don't have a scope to actually measure the output of the sound card but according to some sites the output should be in the 2v peak to peak range. The waveforms in the picture...
Monday, 5 December 2011 - 20:42
Sound card output signal biasing ?
Just to make sure, I can use an electrolytic polarized capacitor can I ? And connect the negative terminal to the signal source, am I correct ?
Monday, 5 December 2011 - 19:55
Level shifter circuit + diode clamps ?
Geez... now I feel awkward. I dismissed the simple resistor voltage divider too soon it seems. So I guess that diving by 7 is the way to go, I think i'll go with that. Still, I...
Tuesday, 22 November 2011 - 18:55
Level shifter circuit + diode clamps ?
Oh wow, I can't believe I missed it. The pin isn't connected to the ground on logic 0, I'll have to add pull downs. I have these statuses that are needed to be monitored in my app...
Tuesday, 22 November 2011 - 16:51
Level shifter circuit + diode clamps ?
5.5v/1uA = 5.5 Mohm input impedance ? Guess i'll use a 200k resistor, the clamp current will be far less than 1mA.
Tuesday, 22 November 2011 - 00:07
Level shifter circuit + diode clamps ?
I want to pickup the fastest change possible, I don't know how fast bjt's go though. The logic levels on the 28v line are 28 = "1" and 0v = "0" so I don't care much about the...
Monday, 21 November 2011 - 22:34
About HD44780 CGRAM and Display RAM.
I was afraid it was like that, that's too bad. Thanks.
Friday, 18 November 2011 - 21:17
Is this simple gate driver circuit viable ?
I don't see any significant difference with/without the suggested diode and capacitor. Guess 22KHz isn't fast enough to see the difference. Anyways, the diode does seem to...
Friday, 18 November 2011 - 12:50
Is this simple gate driver circuit viable ?
Thanks. Why should I limit the rise time ? why not let it just get as high as the drive vs input capacitance allows it ? Is that to protect the push-pull transistors ? I tried...
Thursday, 17 November 2011 - 23:39
Is this simple gate driver circuit viable ?
The forum did let me upload an .asc file (LTSpice)
Thursday, 17 November 2011 - 22:29
Thermal Time Constant ?
If there is a constant power dissipation, the junction should always be RθJC x P hotter than the case (usually 2xP degrees) right ? So even though the junction has a small time...
Saturday, 5 November 2011 - 15:38

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