6V 9V adjustable flow circuit

Description: The adjustable current power supply circuit operates at 6V and 9V, utilizing a minimal number of components, which facilitates easy assembly. The circuit can deliver an adjustable output current of up to 100mA, serving as a suitable alternative to batteries for powering transistor radios. In particular, London’s B power amplifier circuit experiences significant load current variation with changes in volume. Such fluctuations in power supply voltage can adversely affect radio performance. To address this, a resistor (R2) is incorporated into the circuit to ensure that a certain current is consumed even under no-load conditions, thereby maintaining output voltage stability during load current fluctuations. Additionally, resistor R is included to enhance the filtering effect and reduce hum. A switch (S2) is provided to allow for the conversion of the output voltage.

The circuit features a straightforward design that prioritizes efficiency and reliability. The adjustable output voltage is achieved through a combination of resistors and a variable resistor that allows the user to select between 6V and 9V outputs based on the requirements of the connected load. The inclusion of R2 plays a crucial role in ensuring consistent performance, as it prevents significant voltage drops during periods of low or no load, which is essential for devices sensitive to power supply variations, such as radios.

The filtering capacitor, associated with resistor R, is strategically placed to minimize ripple voltage and ensure that the output remains stable under varying load conditions. This is particularly important for audio applications, where hum and noise can significantly degrade sound quality. The switch S2 not only facilitates easy voltage adjustments but also simplifies the circuit's operation, making it user-friendly.

Overall, this adjustable current power supply circuit exemplifies an efficient solution for powering low-current electronic devices, providing stable voltage outputs while minimizing noise and ensuring reliable performance across different load conditions.6V, 9V adjustable current power supply circuit shown in Figure 12-9, using fewer components, easy to assemble, the output voltage of 6V, 9V adjustable output l J current can re ach lOOmA, can replace the battery to power transistor radios. London using B power amplifier circuit, the load current varies greatly with the volume, if such a power supply voltage variation is relatively large, this work is detrimental to the radio. Therefore, the circuit is set resistance Rz, in the no-load power, it also consumes a certain current, the load current fluctuation when output voltage is still relatively stable j resistance R, is to improve the filtering effect of reducing hum and set up.

S2 is provided for the conversion of the output voltage.