A simple single-tube radio is designed for radio stations operating in the medium (200-500 meters) and long (800-2000 meters) wavelengths range. Tuning to radios is done by a variable capacitor. Reception is on the handsets.
One-tube and two-tube radio receiver, design, parts, schematic and wiring diagrams, power supply, radio tube pinout.
The radio uses a lamp type 2K2M or 2ZH2M. To increase the sensitivity of the reception, positive feedback was used. Feedback adjustment is carried out by a variable capacitor C4. It is also possible to receive radio stations on a crystalline detector, for which there are sockets D and T1. When switching to the detector, the radio lamp turns off, and the phone and detector are inserted into the sockets of the detector circuit.
Schematic diagram of a single-tube radio amateur novice radio amateur.
Single-tube radio design.
The radio is assembled on a wooden corner panel made of three pieces of plywood 3 mm thick. The location of the parts on the panel and the wiring diagram are shown in the diagrams below. On the front side of the panel is a dial. It can be made in the form of a rotating handle, on which the division is applied. A mark (risk) is shown on the panel, showing how many divisions the control knob is turned.
Location of parts on the corner panel of a single-tube radio.
Wiring diagram for a beginner ham radio receiver.
Single-tube radio parts.
In this radio, all parts, with the exception of the coils, are applied factory-made. Rheostat R4 can also be used as a power switch. If it allows its design. In another case, you need to put a separate switch of any type or disconnect the power wires from the battery.
As a range switch P, you can use any single-pole two-position switch. The dimensions of the frame and coils are shown in the figure below. A single-layer coil L1 consists of 110 turns of PEL wire 0.15, and L3 consists of 60 turns. PEL wire 0.1. A multilayer (wound in bulk) coil L2 contains 260 turns (130 turns in each section) of PEL 0.15, and L4 contains 80 turns of PEL 0.1.
The sizes of the coils of a single-tube radio receiver and their location on the frame.
Power supply for single-tube radio.
The normal voltage of a 2K2M lamp is 2 Volts. But in this radio receiver the lamp will work even with a filament voltage of 1.5 Volts. To power the glow, you can use one or two galvanic cells. The excess voltage is suppressed by the rheostat R4. The radio operates at an anode voltage of 25-60 volts. To obtain a better reception, use an outdoor antenna and well-made grounding..
Finger-type twin-tube radio, design, parts, circuit diagrams, power supply.
The finger receiver radio 1K1P (grid detector with feedback) and 2P1P (low frequency amplifier) is designed for medium (200-550 meters) and long (750-2000 meters) radio waves and allows you to listen to local and nearby powerful radio stations on the speaker. It can also work as a single tube or as a detector radio.
Schematic diagram of a two-tube finger-type radio receiver.
Design of a two-tube finger-type radio.
The radio is assembled on a corner chassis with a front panel measuring 200×140 mm.
Fingerprint Radio Wiring Diagram.
Parts of a two-tube finger-type radio.
Coils are wound with PESHO 0.15 wire on a common frame, which can be a cardboard sleeve from a 16-gauge hunting cartridge. Coil L1 contains 90, L2 – 300 and L3 – 80 turns.
The device coils of the radio on finger lamps.
Power supply of a two-lamp radio receiver on finger lamps.
To power the radio, you can use the BAS-80 anode battery and the BNS-MVD-500 incandescent battery. This set of batteries provides power to the radio for 5-6 months with daily work at 4-5 hours. When switching to one lamp, the L2 output lamp is removed from the socket, and the handsets are plugged into T2 sockets.
To use the radio as a detector, the antenna is connected to terminal A2, the detector is inserted into jacks D, and the handsets are plugged into jacks T1. Both lamps of the radio in this case are removed. For normal operation of the radio, an external antenna and good grounding are required..
Radio tube pinout.
The numbering of the pins of the radio tubes with the octal base from the 1st to the 8th pin goes from the beard of the guide key in the direction of movement of the hour hand. At the same time, the lamp base or lamp socket must be viewed from below.
The top terminal on the lamp bulb is usually the terminal of the lamp control grid. The numbering of the pins for the finger lamps comes from the free gap at the bottom in a clockwise direction. The wiring of the 2K2M and 2Zh2M lamps is the same.