| Electronics > Beginners |
| Best choice oscillator for low powerdraw, low component count, ca 1-5kHz |
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| bd139:
I respect someone who calls me up on my incompetence ;) |
| SiliconWizard:
Does it have to be stable or precise? If not, a simple RC oscillator around a single-gate inverter with a schmitt trigger input should not draw much at around 1kHz... |
| Audioguru:
Why do you want a voltage doubler/booster circuit? I have designed and made thousands of circuits that use a supply voltage or parts that work properly together without doubling or boosting the voltage. If you want to learn about the simple phase shift or mutivibrator oscillators you made that did not work then please post all the details (supply voltage, parts list and load resistance) of the ones you made. Maybe you simply got the transistor pins connected backwards. The pins on an American little transistor are EBC but on a European transistor they are reversed at CBE, as shown on their datasheets. |
| ALonda:
--- Quote from: SiliconWizard on July 10, 2019, 03:14:51 pm ---Does it have to be stable or precise? If not, a simple RC oscillator around a single-gate inverter with a schmitt trigger input should not draw much at around 1kHz... --- End quote --- I imagine not, for the 14V was to adjust it with a variable-zener circuit afterwards as it only has to supply 2uA (verified). For the 3.5 to 4V -> 5V I have bought some cheapo 5V 200mA regulators. Kleinstein mentioned that voltage booster circuits should run on square wave for best efficiency, so I think that rules out the RC oscillator in this application, even though Im still interested in learning to put together an oscillator with just resistors, caps and single transistor, or designs like that. The astable multivibrator would work I guess, but I havent made it work personally. |
| ALonda:
--- Quote from: Audioguru on July 10, 2019, 04:13:22 pm ---Why do you want a voltage doubler/booster circuit? I have designed and made thousands of circuits that use a supply voltage or parts that work properly together without doubling or boosting the voltage. --- End quote --- Your question made me question my own plans (for world domination). Ive designed a kind of data transmission over powerlines kind of circuit (I know there are ICs) and to protect against the "short circuit" of signals, voltage drops are involved. So my simple caveman brain just though to boost the voltage at the receiver side with some simple circuitry to get a stable nice 5V. But I might aswell run the powerline at 9V and straight up regulate at the receiver end, that'd even improve the power efficiency (the powerline will be upwards of 10 meters long, but <200mA expected) But the 14V application is for a double random noise generator circuit that only needs ~2uA and Itd be too klunky to use a 14V+ powerbrick just for that when all the other circuitry is 5V. |
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