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Staigen
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Here is version 1.0 :
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I have designed a few components for the ExpressSCH. Maybe somthing for others to share? Can I upload it to you, or shall i send a link to my homepage?
//Staigen -
The forum at Techlib.com is back again!
Urls:
Techlib.com:
http://www.techlib.com/
The forum:
http://www.techlib.com/disc5_frm.htm
//Staigen -
Oops! I forgot, its a monitor :o ::)
//Staigen -
I need a Service Manual or shema for a
Hewlett Packard Ergo 1024
Model D2831A
//Staigen -
Ok, BTW, you can connect the transformer directly to the phone line via a relay or something, thats the way modems are connected.
//Staigen -
Ok, i am not so good at the english language, but you did not answer the question! And its transmitter, not transmiter
//Staigen -
I know what DTMF is, i have known it for about 30 years now, what i was curious about was what a TRANCIEVER is used to
//Staigen -
What is a DTMF tranciever used to? Just curious!
//Staigen -
Hi there Mozikluv, if C3/R7 is connected to pin 6 of U2 the signal goes to the +(noninverting) input of U2 and the amp acts as a second order lowpass filter (like it says i the text), and if C3/R7 is not connected to pin 6 then i belive its a allpass filter with a little dip at the resonance frequency and some reduced output in the high passband! There is also somthing else that i dont like with this schematic, regarding the U5 opamp, it is not properly biased.
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I belive there is a little drawing error at U2. C3 and R7 shall be connected to pin 6 on U2.
0-30 Vdc Stabilized Power Supply
in Projects Q/A
Posted
I also have a few sugestions for this circuit, but also a warning. First i sugest that you bypass the diodes D1 to D4 with a couple oh caps, about 1nF to 4.7 nF, soldered directly over the diodes. Also bypass diode D7 with a cap, lets say 10 MFD to 47 MFD. The supply to the IC:s should also be bypassed with a ceramic cap, about 100 nF. And so the warning, how about the SOA(Safe Operating Area) of the output pass transistor Q4?
//Staigen