Talk:DIAC

message: How can I measure the diac and thyristor?
:The standard method is to use a curve tracer, a specific kind of electronic test equipment that looks like an oscilloscope but can apply a variable, bipolar voltage to the device under test and measures the resulting current. Curve tracers can also apply base (trigger) bias and display how that affects the resulting change in the V-I curves.
:You can kludge up a minimalist curve tracer using an ordinary oscilloscope, an isolation transformer, and a load resistor.
:Atlant 23:53, 8 August 2005 (UTC)
thread_title:  Measuring DIACs (and other thyristors) 

message: i am a fresher and wanted ta kno abt diac... the explanation is quite hard to understand..—Preceding unsigned comment added by 220.227.67.171 (talk • contribs) 
a diac, its just a 2-way diode that will only conduct electricity (including AC, or oscillating current) when the breakdown voltage is exceeded.  XU-engineer 18:49, 26 July 2007 (UTC)
thread_title:  can u simplify the explanation?? 

message: The DIAC article makes no mention of MOV or surge supression.
It appears from my investigation of 2 separate SMPS's (Switch Mode Power Supply) that a DIAC or Silicon Bilateral Voltage Triggered Switch is performing the same function to a MOV (Metal Oxide Varistor) or VDR (Voltage Dependant Resistor). In my case both power supplies have either two 150 Volt DIAC's or MOV's situated after the bridge rectifier, between the main DC filter capacitors from 0 volts and positive rail and 0 volts and negative rail. 
I don't have a login thus can't edit the article.
Please add a 'See also' heading.  —Preceding unsigned comment added by 124.171.147.1 (talk) 07:54, 7 December 2008 (UTC)
replies: text: You don't need to login to edit. Just go ahead and do it.  —Preceding unsigned comment added by 86.153.60.15 (talk) 17:03, 5 January 2009 (UTC)
thread_title:  DIAC has same function as MOV. 

message: I see these terms for these components from time to time. Are they just another term for DIAC and SIDAC? The Dutch Wikipedia has an article describing them. The SBS characteristic are similar to the DIAC, but with a lower gate voltage trigger level. Perhaps these parts are obsolete. New stock is still easily found at distributors. At any rate, Silicon Bilateral Switch is found easily and often enough in English web sites that I think there should at least be a redirect from Silicon Bilateral Switch and Silicon Unilateral Switch to one of the thyristor articles. For device examples look up 2N4991 (SBS) and 2N4990 (SUS). --NoahSpurrier (talk) 19:32, 26 September 2014 (UTC)
replies: text: A Silicon Bilateral Switch (SBS) is like a DIAC, but additionally has the internal gate brought to an external pin, and there are resistors in parallel with the emitter-base and base-emitter of the two 'internal' transistors.  The I-V transfer characteristic is slightly different.  With the addition of your own external zener diodes (of a lower voltage), you can lower the breakover voltage of the SBS.  24.78.190.118 (talk) 09:41, 24 November 2019 (UTC)
thread_title:  Silicon Bilateral Switch (SBS) and Silicon Unilateral Switch (SUS) 

message: Both terms are used in the article but only the latter is explained. If they mean the same then one should be chosen and used consistently, otherwise the difference needs to be explained. 87.75.117.183 (talk) 15:01, 7 November 2022 (UTC)
thread_title:  Breakover or breakdown voltage? 

message: The symbol shown is a MOV.  The DIAC symbol looks like two diodes in series connected at a common cathode.  Here is a data sheet showing the correct symbol: . Scan down to the test circuit.  The device labeled D.U.T. (device under test) is the DIAC.Constant314 (talk) 20:49, 18 June 2023 (UTC)
thread_title:  Wrong symbol