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For Karl: A simple frequency generator kit that produces a 1kHz sine wave using an incandescent light bulb.
Kit on eBay:
Sine Wave Audio Signal Generator Preamplifier / Audio Signal Source Tester Kits https://www.ebay.com/itm/-/322528955226
For Karl: A simple frequency generator kit that produces a 1kHz sine wave using an incandescent light bulb.
Kit on eBay:
Sine Wave Audio Signal Generator Preamplifier / Audio Signal Source Tester Kits https://www.ebay.com/itm/-/322528955226
You should not expect the lamp to light. It's there as a PTC resistor to improve the THD of the oscillator.
I HATE blue background resistors!! – So hard to see the colours properly.
I much prefer the ocre/tan coloured ones.
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I assume you include Links so people can see were to buy the items. Ebay doesn't know anything about the Links you provide. What gives ?
Have you tried your Links, they don't work. Not for me anyway. Is there some secret ? What is it ?
Julian is so adorable, I feel like he's the kind of guy that has picnics in that park at the weekend. So wholesome :3
When you were concerned about the 13.5 volt supply, you forgot about the 9 volt Zener across the supply. The 4700 series diodes are rated at one watt, so that is not a concern at the elevated voltage. The 220 ohm 1/4 watt's rating is more of a concern. 13.5V – 0.7 V = 12.8V – 9.1V = 3.7V 3.7*3.7/220= 0.062 so 62mW will not be problem.
The light will not glow. The nonlinear resistance of the tungsten lamp helps lessen the distortion of the sine wave.
Many schematics for sine wave generators with op amps use an incandescent light bulb in the dc feedback path to adjust the gain in the inverting input but i dont know the reason why,at least i hope all the led lighting fans out there not to find it outrageous and not ecofriendly enough.I want to make an 1KHZ sinewave oscillator for inductors measurement circuit and this circuit looks nice.
Did you get around to testing the kit – if so how did the results show for quality?
Really informative video Julian – Love the way you explain things as you go.
As quick as that iron heats up, you wasted a good bit of your battery power doing things the way you did. I'd have put all of the resistors and the diodes in at once, then fired it up and soldered it, turning it off at that point. But attention to detail when it comes to this stuff is a good thing! BTW, the proper term for the function of that 9013 transistor is "buffer", so you're not loading the oscillator circuit with whatever you connect to the output. And, it's quite normal not to see any visible indication in the light bulb when one is used in these circuits. Disconnecting one end of the bulb from the board and measuring the current will show you why, it's a LOT less than the bulb's typical operating current.
What is a sine wave
Julian, Please Do the Another kit Build!
I bought one of these eBay Sine Wave Audio Frequency Generators (or 1kHz oscillator).
After building it, these were my results:-
Supply Voltage: 12.6V
Current consumption: 18.2mA
Maximum AC output: 6V peak-peak (oscilloscope)
Maximum AC output: 2.068V RMS (multimeter)(Fluke)
Output Frequency: 1.0302kHz (frequency counter)
Output Frequency: 1.0303kHz (multimeter)(Fluke)
All of the above after adjusting for the best quality sine wave signal with minimum distortion (on my analogue oscilloscope).
(Note that I borrowed my works Fluke multimeter for the frequency and RMS readings).
No part two then Julian?
For my last through-hole kit build, I held the PCB in a vice and soldered the components from the top side. Let gravity work for you, instead of against you.