Discrete Components FM Frequency Modulation Superheterodyne Radio Kit DIY Electronics

DIYFull set of discrete FM radio，Using thin film medium20P*2Double variable capacitor based on DC，Use a piecePCBPut the FM head and power amplifier into it，It overcomes the shortcoming that the former FM head needs power amplifier and air quadruple，Make fond ofDIYFM radio friends no longer worry about the expensive air quadruple。thisFMThe circuit board has been designed and tested repeatedly，Finally, it is confirmed thatPCBThe design version is the finalized version，Because the layout is reasonable，This machine has no interference and self excitation，The sensitivity and selectivity are also very high，The audio power amplifier adopts theOTLCircuit，Good sound quality，The whole machine adopts6Vpower supply，Quiescent current in11mAabout，Suitable for battery power supply and AC rectifier power supply。If AC rectifier is used，Two groups of different power supply can be used，6VPower the radio head，Another group can be used9—20VPower amplifier，So as to improve the output power。Circuit board size19x5.5cm。Kit without horn and antenna，The antenna adopts flexible wire2-3It can be used as a trailing antenna。
This kit is not finished，You need to weld yourself，The picture shows the finished product。