40W FM transmitter with valve EL34

  
The catering better it does not become at straight line from the network 220V but via transformer 220V/220V of isolation and safety 1A. When does not exist the R3, the force of expense is bigger, but respectively is increased also the hum 50Hz, because the simplicity of designing. With the C2 we regulate the frequency. With the C1 we adapt the resistance of aerial (practically him we regulate so that it is heard our voice in the radio as long as you become cleaner).
40W FM transmitter with valve EL34 - schematic

The control (Audio In) can become from a kasseto'fwno or other powerful source. If it is microphone it will be supposed precedes amplifier so that it acquires a force of order of 8W roughly. R1 15KW/2W R2 1KW/10W R3 1KW/10W (for biggest force in the exit you replace with short-circuit). C1 50pF trimmer C2 30pF trimmer C3 22pF/4KV C4, c6, c9 10nF/1KV C5, c7 1nF/1KV C8 100mF+100mF/450V (Double electrolytic) C9, c10 10nF RFC1, rfc2, rfc3 air Inductors: 15 coils diameter 8mm, from wire 1mm. T1 Transformer 220V/6V-1A T2 Transformer of configuration with being first 4 or 8W T3 Inductor with core ferrite (externally it resembles with small transformer but has a turn only). D1 BY127 rectifier Lamp 807 SYLV USA or EL34 or equivalent ANTENNA Simple dipole L/2. (L= wave length) S1 Main switch of catering. S2 Switch of catering of rise (him we close after zestacej' the thread).



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