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Subject: Re: Problem
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
Date: Wed, 18 Dec 2002 07:13:19 GMT
NNTP-Posting-Date: Wed, 18 Dec 2002 08:13:19 MET
Rudolf Maier wrote:
> i have some problems with a circuit i should built:
> what i have:
> power supply +5V fixed and +/- 20V variable.
> what i should get:
> square wave output, variable frequency control: 5-20KHz. Variable
> output amplitude: 1-10Vpp. Variable offset control: +/- 5Vdc. Less
> than 10% distortion of square wave when output is driving a 1KOhm
> I know I could buy a function generator doing this stuff. But I should
> built it myself with the easiest components i can find in the lab.
> Could someone give me some hints?
Use a +/-15V supply. Dual opamp(NE5532), 1st configured as a comparator with
From output adj. resistor(2-10k) to capacitor(22n) at inverting input and
resistor(10k) to non-inverting input. From there a resistor 5.6k to gnd.
2nd opamp configured as an inverter adj. 10k...110k from output opamp1 and
10k from output opamp2 to inv._in, and the adjustable offset voltage 10k pot
on both ends a 10k to +15V resp. -15V, wiper to non-inv._in, 100n capacitor
electronic hardware designer
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