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Hi! Answering your first question, when you measure voltage with a VOM (specially analog VOM) a small current flows through it. This small current slowly discharges the cap. As for the second, bear in mind that you are not measuring a fixed voltage but rather a sawtooth wave (see simulation image) with a rapidly varying voltage. A VOM (specially digital) doen not update display fast enough to reflect actual voltages.
Magnificent project and instructable. Congratulations!
https://www.quora.com/Whats-the-reaction-between-I...Chemistry is not my strong suit, but I found this on the net, and it could indicate Chlorine gas is released during the etching process.
I had read somewhere and had always assumed chlorine was the responsible for the smell. Now after reading your comment and researching, i am in doubt. In any case, to avoid possible misinforming I have removed the statement from the article. Thank you! .
Sponge Etching Method for P...View Instructable »
Standard electrolytic has higher leakage than tantalum but should work nevertheless. Value of cap should not be larger than 10uF, or will never reach the required voltage. Ferrite cores are conductive... make sure windings are not shorting through it. Does led light when you short the header pins?
HI! in this same comment section you can find a reply (7 months ago) to your question. That circuit diagram is suitable for your amp (higher voltage supply). In that case it was +30V / -30V. Extreme caution when opening your amp as you will have around 85v between + and - rails. Capacitors may hold the charge for a long time even after disconnecting the amp from the mains..
Are you using a red LED? Red leds have a forward voltage drop of aruond 1.6V, not enough for the CD4001. I have posted an update to this circuit https://www.instructables.com/id/10-Year-LED-Flashe... with a PCboard download. This new circuit has no LED f(v) limitations. Greetings!
Both symbols ( yours and the author´s ) are correct and correspond to an NMOSFET. The authors´s symbol is a simplified symbol which does not show the internal bulk-source connection. IEEE (Institute of Electrical and Electronics Engineers) accepts this symbol as a valid NMOSFET symbol. Nothing more to say.
PWM (pulse width modulation...View Instructable »
Muchas gracias y Feliz Año ! Aguante Rosario !!
muito obrigado meu amigo! I have visited and also subscribed to your wonderful youtube channel. Keep in contact via PM. tchau!
the symbol shown is correct.https://www.circuitlab.com/blog/2013/10/17/new-mosfet-schematic-symbols/
soundfile linkonly added a bit of delay.
soundfile linkOnly added a bit of delay.Mods: replaced R9: was 100K now is 47K. Added 470p ceramic parallel with R12
DIY Logic GatesView Instructable »
Great project & lots of jumpers ! . Check out my clock using CD4017´s and bargraph displays. https://www.instructables.com/id/Bar-graph-display-Digital-Clock/?ALLSTEPS
Hi! nothing really novel in this circuit but yes, it´s my design. I´ll include a soundfile shortly. Thanks!
last minute mod. This improves the schmitt trigger action, for a longer suboctave sustain.
Guitar Overdrive + Sub-octaverView Instructable »
one of the blacks to battery (+) the other to transistor Collector + diode anode +jumper. The yellow (center tap) is not used.
hi!4401 is perfect
post an image of your circuit. See if I can help.
the 4th cap is for decoupling but is not mandatory. (not necessary)
HI!yellow cap is a 10uF tantalum electrolytic.
I have published a circuit update and a PCBoard download. https://www.instructables.com/id/10-Year-LED-Flashe...and a youtube video:Thanks!
UV "LightSabre" NightlightView Instructable »
Hi!! I interpret your supply is +30v / -30v split supply. Or is it +15v/-15v ? . I optimized the circuit for a +30v/-30v split supply. Change the values to the ones in green color. If supply is other, let me know.Connect circuit to amp as I show in this diagram. Condenser is 10uFx50v electrolytic. Sorry for the transformer drawing , I did it with the mouse!
Hi! sorry, maybe my schematic is not tidy enough. High power amps (and many lower power) have a power (+)supply and a (-)supply voltage (often referred to as "rails") and a 0 volt rail (ground). The -v rail N.C means: NO CONNECTION to the -v rail. The only connections to use are: Supply +v , Supply 0v, and amp output. As for your 18v supply, you should not use it at all. The clip indicator circuit operates from the amp´s own supply voltages. A word of caution: high power amps use high voltage supplies. You may have over 200volts between v+ and v- . A shock could be extremely dangerous. Greetings!!
Hi! This circuit is optimized for higher power amps:
Nice work !! Thank you ! ---|>|---
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