[sdiy] breadboard woes

[Elain Klopke]

Thanks Roman,

Tiny Speaker Test (tm) says that the voltage is indeed dropping off as it
should in this case.


On Tue, Apr 4, 2017 at 3:09 PM, Roman <modular at go2.pl> wrote:

> If it's square wave, DC meter will read half of amplitude, as it's just
> average value.
> This is also RMS value so if your meter shows less in AC range, it's
> probably a model measuring average value and adjusting it for sine crest
> factor.
> And if you see the same value before and after the filter, it may be
> because corner frequency of that filter is higher than input frequency.
> BTW, checking how that circuit works would be way better with a speaker
> than voltmeter. Or at least oscilloscope. You're after interesting sonic
> values and not numbers on DVM, right? Build a filter that sounds good to
> you and then recalculate its values for all 96 frequencies.
>
> Roman
>
> Dnia 4 kwietnia 2017 21:34 Elain Klopke <functionofform at gmail.com>
> napisał(a):
>
> I'm measuring in DC.
>
> Measuring in AC gives me 2.03 volts at the source pin, before and after
> all the resistors.
>
> connecting the resistor to the positive supply and measuring in DC gives
> me a reading of 5.06 V as if it was a plain bit of wire.
>
> this is baffling because I checked the resistor with the resistance
> function again and it measures fine.... I even switched to the Hz function
> and measured the output square waves from the chip and got the expected
> frequencies.
>
> On Tue, Apr 4, 2017 at 2:00 PM, Byron G. Jacquot < <thescum at surfree.com>
> thescum at surfree.com> wrote:
>
> Are you measuring AC or DC volts?
>
> 2.4VDC might be an OK reading for a 5VAC square wave, depending on how
> your meter integrates it.
>
>
> -----Original Message-----
> From: Elain Klopke
> Sent: Apr 4, 2017 12:43 PM
> To: *SYNTH DIY
> Subject: [sdiy] breadboard woes
>
> So I was trying to get a reading on my breadboard to see how much voltage
> was lost between the input of three passive low pass filters in series and
> the output.
>
> My measurements between ground and:
> positive supply: 5.06 V
> Output from chip: 2.4 V (was expecting 5 V because digital square wave)
> junction of first and second resistor: 2.4 V
> junction between second and third resistor: 2.4 V
> after third resistor: 2.4 V ....
>
> All resistors measured at 5.07 kOhms. I'm not sure what's going on. Is my
> breadboard messed up somehow or am I missing something fundamental about
> electronics?
>
>
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