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Registered Member #4105
Joined: Sun Sept 25 2011, 02:27PM
Location:
Posts: 7
I need a recommendation on a function generator. I would like something with a range of 35Khz to 100Mhz. I'm working on some coil experiments. Any suggestions would be appreciated.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
First suggestion - refine your requirements; - do you need a function generator, a sinewave oscillator or just a squarewave? - do you need 100 MHz (e.g. doeas your 'scope etc. work up to 100 MHz?)
If squarewave will do (you can make filters to generate sinewaves) I have bought two of these Si570 cmos kits. (3.5 MHz to 160 MHz) They are quite a reasonable price, fairly easy to assemble and work well.
Registered Member #4105
Joined: Sun Sept 25 2011, 02:27PM
Location:
Posts: 7
Thanks for the quick response. I don't have an oscilloscope yet. I've seen several articles about finding a coil's resonance frequency using a function generator. I thought that would be a good starting point. I thought that range(35Khz-100Mhz) would give me room to experiment. I was hoping to pick up something on Ebay at a reasonable price. Oh, and I'm a little embarrassed to say I don't know what waveform I need. I'm still learning.
Registered Member #816
Joined: Sun Jun 03 2007, 07:29PM
Location:
Posts: 156
It might be cheaper and more obtainable to use a lower frequency function generator for general use in the range Hz to several Mhz , usually having a selectable output waveform. Then another instrument a Rf signal generator to for fill your requirement for higher frequencies in the 10’s of Mhz to over a 100Mhz or more, usually only a sine wave output, but often the output level is more accurately defined, or calibrated in terms of db’s, if you need to calculate sensitivity or gains on whatever your working on. ect.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
If you have a PC there are many free downloadable programs to turn the sound card into a signal generator or oscilloscope.
Working in the kHz range is much easier than the MHz range e.g. using a half-wave (one diode) or full-wave (four diodes) rectifier to measure ac voltages, or even just a multimeter on ac ranges. e.g. you could use an audio amplifier to give 'stronger' output signals, or amplify weak signals.
Working in the MHz range 'strange' things happen and without a 'scope you will confuse yourself.
Before you start measuring coils etc. measure your equipment i.e. over the frequency and voltage range that you intend to use check the response of your rectifier(s), meter, amplifier or whatever.
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Function Generator
