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==Closed, COTS Hardware for PC Oscilloscopes==
 
==Closed, COTS Hardware for PC Oscilloscopes==
 
* For low frequencies, pretty much any external sound card with a line input will work. External card line inputs generally have a range around 0-1 V whereas onboard microphone inputs only have up to about 50 mV, which just isn't enough sensitivity. The [http://vtluug.org/wiki/Lab-in-a-Box Virginia Tech Lab-in-a-Box] recommends the Behringer UCA202. To use a sound card oscilloscope on a regular basis, a circuit with variable attenuation is recommended (i.e. 1x and 10x). Compensation for the hardware and software gain can be done as part of the attenuator circuit or in software.
 
* For low frequencies, pretty much any external sound card with a line input will work. External card line inputs generally have a range around 0-1 V whereas onboard microphone inputs only have up to about 50 mV, which just isn't enough sensitivity. The [http://vtluug.org/wiki/Lab-in-a-Box Virginia Tech Lab-in-a-Box] recommends the Behringer UCA202. To use a sound card oscilloscope on a regular basis, a circuit with variable attenuation is recommended (i.e. 1x and 10x). Compensation for the hardware and software gain can be done as part of the attenuator circuit or in software.
 
For mixed-signal development, where debugging requires you to see both analog and digital signals at the same time, oscilloscopes intgrated with logic analyzers are needed. More advanced features here include protocol decoding, which allows you to easily see the values sent over digital interfaces.
 
 
Examples here include:
 
 
The Parallax [http://www.parallax.com/Store/Microcontrollers/PropellerTools/tabid/143/ProductID/586/List/0/Default.aspx?SortField=ProductName,ProductName PropScope PropScope] ($200) offers 25Msps sample rate and 4 bits of logic analyzer and 4Kbytes of buffer.
 
 
The QuantAsylum [http://www.quantasylum.com/content/Products/QA100.aspx QA100] ($349) offers dual 100Msps sample rate and up to 32 logic channels with 2Mbytes of buffer.
 
 
The PicoScope 100 ($575) offers a single channel at 40 Msps, 8 logic analyzer channels and 16Kbytes of buffer depth.
 
  
 
==PC Oscilloscope Software==
 
==PC Oscilloscope Software==

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