Today's radios are mostly small-sized portable or pocket models. Most of them use two No. 5 (or No. 7) batteries to supply "3V" voltage. It is particularly convenient when going out and carrying it. However, if battery power is used at home or on the go, the cost of the battery is relatively large and not economical. This kind of radio is generally equipped with a socket that can be powered by an external power supply; as long as it can be equipped with an appropriate power converter such as a DC3V output voltage, it can be powered by an external power supply, thereby reducing battery consumption and expenses.
However, the "AC220V/DC3V" type power converter that can be properly matched with the radio performance is not easily available in the market. Although there is a "DC3V ~ 12V" small transformer is a secondary with multiple taps, coupled with rectifier filter power converter, before use, must first be adjusted to "3V" block, and then measure the output plug with a multimeter The voltage value. Due to no voltage regulation, up to 6V is possible under no-load conditions. If used at this voltage directly into the radio. People will worry about the safety of the radio. And the ripple coefficient is large, the radio emits a large amount of AC noise. The effect is not so good. The author has a radio charging charger for the plug-in line of the radio external power socket. This charger is a DC5V voltage output. It is a switching power supply AC/DC voltage converter circuit structure, and the volume is also very small. After the measured output plug voltage, DC5V voltage value is very stable. The "5V" voltage output is very close to the radio's "3V" supply voltage; With its slight modification, so that it can generate a daily DC3V voltage, as an external power supply for the radio.
The 5V DC voltage into 3V, can be used as shown in the circuit shown in the figure, this method can avoid the original charger circuit changes under the premise. Only use diode D1 to D4 (1N4001 type) diodes connected to the output line to form diode PN junction voltage drops. So that the output line with the core plug output in line with the radio work required 3V voltage, power supply to the radio. In addition. Considering that it does not affect the charging function of the charger to the mobile phone, a toggle-type small-scale second-shift switch K1 is also provided in the additional link. When dialing "3V" block, DC5V voltage drops after D1 ~ D4. The formed 3V DC voltage is supplied by K1 to the output terminal of the same core plug; in this state, the pressure drop after the series connection of D1 to D4 can be used to make the LED obtain the step-down indication through R1. If the charger is still charging the mobile phone, the K1 switch can dial 5V; at this time, the DC5V output from the charger circuit can safely restore the charging function of the mobile phone. It also provides power for 6V or 4.5V radios.
After such restructuring, it was inserted into the radio to try it out. The results were very satisfactory. Radio work sound clear and loud. And no communication noise. And the receiving sensitivity also appears to be higher than before.
However, the "AC220V/DC3V" type power converter that can be properly matched with the radio performance is not easily available in the market. Although there is a "DC3V ~ 12V" small transformer is a secondary with multiple taps, coupled with rectifier filter power converter, before use, must first be adjusted to "3V" block, and then measure the output plug with a multimeter The voltage value. Due to no voltage regulation, up to 6V is possible under no-load conditions. If used at this voltage directly into the radio. People will worry about the safety of the radio. And the ripple coefficient is large, the radio emits a large amount of AC noise. The effect is not so good. The author has a radio charging charger for the plug-in line of the radio external power socket. This charger is a DC5V voltage output. It is a switching power supply AC/DC voltage converter circuit structure, and the volume is also very small. After the measured output plug voltage, DC5V voltage value is very stable. The "5V" voltage output is very close to the radio's "3V" supply voltage; With its slight modification, so that it can generate a daily DC3V voltage, as an external power supply for the radio.
The 5V DC voltage into 3V, can be used as shown in the circuit shown in the figure, this method can avoid the original charger circuit changes under the premise. Only use diode D1 to D4 (1N4001 type) diodes connected to the output line to form diode PN junction voltage drops. So that the output line with the core plug output in line with the radio work required 3V voltage, power supply to the radio. In addition. Considering that it does not affect the charging function of the charger to the mobile phone, a toggle-type small-scale second-shift switch K1 is also provided in the additional link. When dialing "3V" block, DC5V voltage drops after D1 ~ D4. The formed 3V DC voltage is supplied by K1 to the output terminal of the same core plug; in this state, the pressure drop after the series connection of D1 to D4 can be used to make the LED obtain the step-down indication through R1. If the charger is still charging the mobile phone, the K1 switch can dial 5V; at this time, the DC5V output from the charger circuit can safely restore the charging function of the mobile phone. It also provides power for 6V or 4.5V radios.
After such restructuring, it was inserted into the radio to try it out. The results were very satisfactory. Radio work sound clear and loud. And no communication noise. And the receiving sensitivity also appears to be higher than before.
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