Active Voltage Doubler

The following diagram represents the schematic of an Active Tone Control circuit, commonly referred to as "ACTOR." The Active Tone Control circuit is an electronic audio circuit designed to enhance the loudness of audio signals by adjusting bass and treble levels, utilizing the Baxandall system. Additionally, there is an active antenna designed for FM, AM, and shortwave (SW) radio receivers. This active antenna is equivalent to a 20 to 30-foot wire antenna, making it suitable for receivers that utilize untuned wire antennas, such as budget models and car radios. Furthermore, the circuit includes an electronic siren based on the NE555 timer, which produces a sound resembling a factory siren. This siren circuit employs the 555 timer IC configured as an astable multivibrator with a center frequency of approximately 300 Hz, controlled via pin 5 of the IC. When the power supply is activated, the circuit operates accordingly. Additionally, a simple fire alarm circuit based on the NE555 timer is included, utilizing a thermistor as a temperature detector. This thermistor activates a transistor at elevated temperatures, exhibiting low resistance at high temperatures and high resistance at low temperatures. The positive voltage regulator circuit employs a PNP boost transistor, with the IC8211 providing voltage reference and regulation. The Q1 transistor serves as the series pass transistor, while R1 sets the output current of the IC8211. Capacitors C1 and C2 ensure loop stability and mitigate input transient feedthrough to the output supply. Lastly, an adjustable power supply is described, offering an adjustable output voltage range of 6-12 DC volts. The component parts list includes a transformer (T1) rated at 115/220 VAC, Q1 options such as 2N1613 or NTE128, a bridge rectifier (BR1) rated at 40V, 4A, and a 470-ohm, 5% resistor (R1).

The Active Tone Control circuit, or ACTOR, is engineered to modify audio signals in a way that enhances listener experience by allowing users to fine-tune bass and treble levels actively. The Baxandall tone control circuit is a popular configuration for achieving this, as it provides smooth and musical adjustments to the audio signal without introducing significant distortion.

The active antenna circuit is designed to improve reception quality for various radio bands. By utilizing a compact form factor, this circuit effectively mimics a longer wire antenna, which is particularly beneficial for portable or space-constrained applications. The active antenna amplifies weak signals, making it an ideal choice for inexpensive receivers that lack built-in tuners.

The NE555 timer-based electronic siren circuit is straightforward yet effective. The astable multivibrator configuration generates a square wave signal at a frequency of approximately 300 Hz, which can be adjusted by varying the voltage at pin 5. This feature allows for customization of the siren tone to suit specific applications, such as alarms or alerts.

In the fire alarm circuit, the thermistor serves as a critical component for temperature detection. As the temperature rises, the thermistor's resistance decreases, allowing current to flow and activating the connected transistor, which can trigger an alarm or alert system. This simple yet effective design is suitable for various safety applications.

The positive voltage regulator circuit with the PNP boost transistor ensures a stable output voltage, vital for powering sensitive electronic components. The use of the IC8211 for voltage regulation simplifies the design while ensuring reliable performance. The inclusion of capacitors for stability and transient suppression enhances the overall robustness of the circuit.

Finally, the adjustable power supply circuit offers flexibility in powering a variety of devices. By allowing users to set the output voltage within a specified range, this circuit can cater to different voltage requirements, making it a versatile addition to any electronics project. The specified components provide a clear guide for constructing the circuit effectively.The following diagram is the schematic diagram of Active Tone Control circuit, or we often call thic circuit as "ACTOR" Active Tone Control or ACTOR is a electronic audio circuit that serves to increase the Loudness (Bass and Treble audio signal) is active because it uses the Baxandall system. This circuit does not use a. This is an active antenn a for FM radio receiver, AM radio receiver and SW (shortwave) radio receiver. On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. This circuit is designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios. . Here the circuit diagram of electronic siren based NE555. This circuit produces a sound like factory siren. It applies a 555 timer IC which is utilized as an astable multivibrator of a center frequency of about 300Hz.

The frequency is controlled by the pin 5 of the IC. When the power supply is switched ON, . The following circuit is a simple fire alarm circuit based NE555 timer and use thermistor as a temperature detector. This sensor will activate the transistor when the temperature is in high value. The thermistor will have a low resistance at high temperature, while at low temperature, the transistor resistance is high.

This characteristic of thermitor. Positive voltage regulator circuit with PNP Boost transistor The IC8211 presents the voltage reference and regulator amplifier, while Q1 will be the series pass transistor. R1 defines the output current of the IC8211, while C1 and C2 present loop stability and as well act to suppress feedthrough of input transients to the output supply.

R2. This is an adjustable power supply which have adjustabled output voltage from 6-12 DC volt. Component Parts List: T1 = 115[220]/8 VAC transformer. Center Tap not needed. Q1 = 2N1613, NTE128, or substitute. (TO-39 case) On coolrib! BR1 = 40V, 4A. (Check max current of your mini-drill and add 2A) R1 = 470 ohm, 5%. 🔗 External reference