Description:
Elementary questions about electronics.
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Broadband transformer center tap?
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I want to use a transformer on the output of a DAC on a AD9834 DDS IC. Heres is a picture of using a transformer on the output of one of Analog devices DDS IC's. [link] If I want to transform from 200ohms (which is what the DAC needs to stay in compliance) to 50 ohms output Z. Is this correct;... more »
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Need a beeping device
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Hi, I am looking for a component to control from a microcontroller to make a beeping noise, nothing to loud but to sound electronic and not like a buzzer. I just need an audible alert that is not to irritating. Any ideas would be great, I don't have a DAC on the microcontroller, and the simpler the better.... more »
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Test equipment search
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I have been wanting a particular test system from a company called ABI Electronics in the UK (WWW.ABIELECTRONIC.CO.UK) They have a test rig called the system 8000 and it does just about everything you would need for a test bench. The only problem is it cost 50K and at this point it is just a fantasy. It can test analog and digital IC's in... more »
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AC coupled offset and gain problem
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I am having trouble understanding the behavior of a circuit I am using to apply gain and offset to a triangle wave. The circuit in question is here: [link] My triangle wave output is 4 +/- 1.6 V, and I want 2.55 +/- 2.45 V out of the gain stage. (0.1 - 5 Vpp)... more »
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How delicate is the output of a CMOS IC?
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Are standard CMOS logic ICs any more susceptible to damage from external causes than BJT devices via the OUTput terminals? By external causes, I mean things like ESD or a mild leakage current from the mains supply. As an example, suppose an output from a 4000 series logic gate is intended to drive an external load, but may be left open at... more »
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