29 In stock
Tube FM Tuner
AM 3-Band Amplitude Mono Radio Finished Board Discrete Components Spring Ray 3P5 Ultra Dynamic Wide Frequency
Model No: WHFB-SP3BDR
This is a three-band radio that is made up of Chunlei 3P5 and ultra-dynamic wide frequency radio circuit and has some modern processing on the circuit and installation.
First, the short-wave oscillation uses a second multiplier, and two short-waves use a same local oscillator. The short-wave oscillation frequency is set at 4.965MHz--9.465MHz, and its oscillation frequency is higher than the Short-Wave I (4.5MHz--9MHz) one intermediate frequency, short-wave II. The 9---18MHz adopts the local oscillator frequency doubling and the series local oscillator pad vibration capacitor, so that the second frequency doubling of the short-wave oscillation is higher than the short-wave II IF frequency after the adjustment of the pad vibration capacitor, so that the processing does not affect the performance. The case reduces the complexity of the circuit;
The second is to use the spring loop 3P5 input loop and oscillation tuning mode, using a 270P × 2 dielectric variable capacitor instead of air variable capacitor.
The third is to adopt a new type of pin-type band switch, which can directly make the band switch and the connecting line on the circuit board, and overcome the trivial and complicated connection mode of the original band switch;
The fourth is the use of pin headers and short-circuit caps and trimming resistors. We know that the circuit after soldering needs to adjust the collector current of each transistor. This is also a very cumbersome thing. For this reason, I use two-pin headers as a set. The electrode open circuit, and each bias current resistor to be adjusted adopts a trimming resistor, which can quickly adjust the bias current without flipping the circuit board. After the test adjusts the current, insert the short-circuit cap of the pin header into the pin header. The circuit can be switched on and the soldering opening is no longer needed.
Fifth, all resonant capacitors use monolithic capacitors with high Q values or mica capacitors of old domestic models to ensure the sensitivity and stability of the whole machine.
PS: Please use DC6V battery as power supply and connect with speaker unit before power on.
1. Frequency: AM: 535-1605 KHZ; Shortwave 1: 4-9 MHZ; Shortwave 2: 9-18 MHZ
2. Power supply voltage: DC 6V battery (no including battery)
3. Power: 1.5W (no distortion )
4. Recommend Speaker unit: 4~16 ohms, 3~4W (no inluding speaker unit)
Discrete components Stereo AM 3-bands radio x 1pc
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