Generate pwm using ic 555 - Revision history

Mol: /* PWM: Add a transistor to more powerful applications */

2024-08-05T18:34:28Z

PWM: Add a transistor to more powerful applications

← Older revision		Revision as of 21:34, 5 August 2024
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	<gallery>		<gallery>
	Ic555 transistor.pdf\|Added a transistor to the simplest method.		Ic555 transistor.pdf\|Added a transistor to the simplest method.
			Ic555 pwm.pdf\|More detailed version. Use two diodes for charging the capacitor and one to prevent EMF current from the motor. Also a resistor is added to reduce base voltage to the npn.
	</gallery>		</gallery>

Mol: /* PWM: Add a transistor to more powerful applications */

2024-08-05T16:53:59Z

PWM: Add a transistor to more powerful applications

← Older revision		Revision as of 19:53, 5 August 2024
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	== PWM: Add a transistor to more powerful applications ==		== PWM: Add a transistor to more powerful applications ==

	~~[[File:~~ Ic555 transistor.pdf~~\|thumb~~\|Added a transistor]]		<gallery>
			Ic555 transistor.pdf\|Added a transistor to the simplest method.
			</gallery>

	The 555 can source or sink (supply or pass to ground) around 200mA, thus to drive larger currents we need an output circuit. The 555 will work from 5 to 15 volts, thus a same voltage source can be used. FOr controlling the motor we use TIP31 NPN transistor (max 3A).		The 555 can source or sink (supply or pass to ground) around 200mA, thus to drive larger currents we need an output circuit. The 555 will work from 5 to 15 volts, thus a same voltage source can be used. FOr controlling the motor we use TIP31 NPN transistor (max 3A).

Mol: /* Add a transistor to more powerful applications */

2024-08-05T16:53:26Z

Add a transistor to more powerful applications

← Older revision		Revision as of 19:53, 5 August 2024
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	See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.		See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.

	== Add a transistor to more powerful applications ==		== PWM: Add a transistor to more powerful applications ==

	[[File: Ic555 transistor.pdf\|thumb\|Added a transistor]]		[[File: Ic555 transistor.pdf\|thumb\|Added a transistor]]
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	Parts		Parts
	* TIP31 NPN Transistor		* 1N4148 x 3; third diode is used in parallel with the motor to suppress the voltage transients as the motor switches ON and OFF.
			* R_o: 1k limits the current flow into the base of the transistor
			* R: 10k
			* Potentiometer: 100k
			* 0.1 uF
			* 100 nF
			* TIP31 NPN Transistor/ BD220 (rated 70V, 4 amps) + heatsink
	* 12V Motor or a dimmable load		* 12V Motor or a dimmable load

Mol: /* Method 3: MOSFET */

2024-08-05T16:37:46Z

Method 3: MOSFET

← Older revision		Revision as of 19:37, 5 August 2024
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	* But more diodes		* But more diodes

	== ~~Method 3:~~ MOSFET ==		== Or a MOSFET ==

	Mosfet allows more current (they operate on a totally different electrical principle).		Mosfet allows more current (they operate on a totally different electrical principle).

Mol: /* Method 3: Transistor to more powerful applications */

2024-08-05T16:37:36Z

Method 3: Transistor to more powerful applications

← Older revision		Revision as of 19:37, 5 August 2024
Line 64:		Line 64:
	See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.		See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.

	== ~~Method 3: Transistor~~ to more powerful applications ==		== Add a transistor to more powerful applications ==

	[[File: Ic555 transistor.pdf\|thumb\|Added a transistor]]		[[File: Ic555 transistor.pdf\|thumb\|Added a transistor]]

Mol: /* Method 3: Transistor */

2024-08-05T16:37:18Z

Method 3: Transistor

← Older revision		Revision as of 19:37, 5 August 2024
Line 64:		Line 64:
	See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.		See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.

	== Method 3: Transistor ==		== Method 3: Transistor to more powerful applications ==

	[[File: Ic555 transistor.pdf\|thumb\|Added a transistor]]		[[File: Ic555 transistor.pdf\|thumb\|Added a transistor]]

Mol: /* Method 3; Back to two resistors */

2024-08-05T16:36:48Z

Method 3; Back to two resistors

← Older revision		Revision as of 19:36, 5 August 2024
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	The two variable resistors ''R''<sub>1</sub> and ''R''<sub>2</sub> can be replaced by only one potentiometer, now named ''R''<sub>1</sub>.		The two variable resistors ''R''<sub>1</sub> and ''R''<sub>2</sub> can be replaced by only one potentiometer, now named ''R''<sub>1</sub>. The charge and discharge timing of the capacitor <math>C</math> is '''bifurcated''' through separate channels via the diodes.

	The charge and discharge timing of the capacitor <math>C</math> is bifurcated through separate channels ~~using~~ diodes.

	See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.		See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.

Mol: /* Method 3; Back to two resistors */

2024-08-05T16:36:12Z

Method 3; Back to two resistors

← Older revision		Revision as of 19:36, 5 August 2024
Line 60:		Line 60:


	The two variable resistors ''R''<~~sup~~>1</~~sup~~> and ''R''<~~sup~~>2</~~sup~~> can be replaced by only one potentiometer, now named ''R''<~~sup~~>1</~~sup~~>.		The two variable resistors ''R''<sub>1</sub> and ''R''<sub>2</sub> can be replaced by only one potentiometer, now named ''R''<sub>1</sub>.

	The charge and discharge timing of the capacitor <math>C</math> is bifurcated through separate channels using diodes.		The charge and discharge timing of the capacitor <math>C</math> is bifurcated through separate channels using diodes.

Mol: /* Method 3; Back to two resistors */

2024-08-05T16:35:44Z

Method 3; Back to two resistors

← Older revision		Revision as of 19:35, 5 August 2024
Line 55:		Line 55:
	== Method 3; Back to two resistors ==		== Method 3; Back to two resistors ==

	~~[[File:~~Ic555 diodes.pdf\| ~~thumb \|~~ The diodes]]		<gallery>
			Ic555 diodes.pdf\| The diodes
			</gallery>


	The two variable resistors ''R''<sup>1</sup> and ''R''<sup>2</sup> can be replaced by only one potentiometer, now named ''R''<sup>1</sup>.		The two variable resistors ''R''<sup>1</sup> and ''R''<sup>2</sup> can be replaced by only one potentiometer, now named ''R''<sup>1</sup>.

Mol: /* Method 2; Longer low time: Diodes */

2024-08-05T16:35:21Z

Method 2; Longer low time: Diodes

← Older revision		Revision as of 19:35, 5 August 2024
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	See the details from [[Generate pwm using ic 555: Add a diode]].		See the details from [[Generate pwm using ic 555: Add a diode]].

	== Method 2; ~~Longer low time: Diodes~~ ==		== Method 3; Back to two resistors ==

	[[File:Ic555 diodes.pdf\| thumb \| The diodes]]		[[File:Ic555 diodes.pdf\| thumb \| The diodes]]

	~~Note that there exists multiple different placements for diodes! I do not follow all of these~~, ~~yet~~.		The two variable resistors ''R''<sup>1</sup> and ''R''<sup>2</sup> can be replaced by only one potentiometer, now named ''R''<sup>1</sup>.

	~~If needed a shorter high time and longer low time, a diode can be connected across <math>R_2+0</math> with cathode on the capacitor side. It is called the PWM mode.~~ The charge and discharge timing of the capacitor <math>C</math> is bifurcated through separate channels using diodes~~. Also, <math>R_2</math> is replaced with a potentiometer~~.		The charge and discharge timing of the capacitor <math>C</math> is bifurcated through separate channels using diodes.

	See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.		See <ref>https://www.homemade-circuits.com/timer-ic-555-explained/</ref> for more text. This might be a good: <ref>https://www.electronics-tutorials.ws/waveforms/555-circuits-part-1.html</ref>.