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Economical Transistor Radio(BC337)

2016-05-06 21:46  
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This article describes Economical Transistor Radio (BC337). The principle is very simple, very practical. The circuit components can help you understand better grasp this principle. For example, in this circuit, you can go to find and buy these components: BC337.

The schematic diagram shows an audio stage with a common-collector circuit. This does not damp the tuned circuit, but instead actually increases its response. This yields good sensitivity and selectivity. Due to the low supply voltage, the subsequent audio amplifier needs three transistor stages. The volume is adjusted using the potentiometer. This radio works well using an internal ferrite rod (around 1 cm diameter and 10 cm long) with a winding of around 50 turns of enameled copper wire. With a two-meter external wire aerial, you can receive even more stations. This radio is not only economical in terms of components, it also needs very little ‘juice’: since the current consumption is only 10mA, an alkaline AA cell will easily last for around 200 hours of operation.


Figure 1 

The specifications, very briefly stated, are:

medium-wave receiver with ferrite aerialoptional supplementary aerialpower supply 1.5 V/10 mA4 transistors
l* oudspeaker output




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