If dB are confusing try to remember they are deci-Bells, invented I believe by Alexander Grahm himself. Convert deci-Bells to Bells and things make more intuitive sense. 4 Bells of gain increase the power by 4 decimal places. Bell worked with the deaf and only indirectly with electricity, so power was a measure of sound level. Voltage was only important if you happened to be using electrical aparatus. So for voltage you have to make a correction. Sherpa Doug > -----Original Message----- > From: jim [mailto:jim@JPES.COM] > Sent: Monday, July 16, 2007 2:12 AM > To: PICLIST@MITVMA.MIT.EDU > Subject: Re: [EE]: What is the relationship between gain and dB. > > > Matthew, > > If you're talking about power gain, 40db is a gain of 10000. > If you're > talking > voltage gain, you're talking about a gain of 100. This can > be calculated by > using the formulas for powewr and voltage as shown below. > > Pg (db) = 10log(Po/Pi) > > where Pg is power gain > Po is output power > Pi is input power > and log is the logarithim > > and for voltage... > > Vg(db) = 20log(Vo/Vi) > > where Vg is voltage gain > Vo is the output voltage > Vi is the input voltage > and log is the logarithim. > > Hope this helps you out. > > Regards, > > Jim > > > > ----- Original Message ----- > From: Mathew @ Everythingit > To: > Sent: Sunday, July 15, 2001 5:47 PM > Subject: [EE]: What is the relationship between gain and dB. > > > I have read somewhere that 40 dB of gain is approximately 200 > times gain. > Does anyone know if this is true and what the formula is to > have work out > the relationship. > > Thanks in advance > > Matt > > -- > http://www.piclist.com hint: To leave the PICList > mailto:piclist-unsubscribe-request@mitvma.mit.edu > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads > > > -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads