dcf77 preamplifier schematics


Posted on Feb 7, 2014

A popular project among microcontroller aficionados is to build a radio-controlled clock. Tiny receiver boards are available, with a pre-adjusted ferrite antenna, that receive and demodula


dcf77 preamplifier schematics
Click here to download the full size of the above Circuit.

te the DCF77 time signal broadcast from Mainf lingen in Germany. DCF77 has a range of about 1, 000 miles. All the microcontroller need do is decode the signal and output the results on a display. The reception quality achieved by these ready-made boards tends to be proportional to their price. In areas of marginal reception a higher quality receiver is needed, and a small selective preamplifier stage will usually improve the situation further. The original ferrite antenna is desoldered from the receiver module and connected to the input of the preamplifier. This input consists of a source follower (T1) which has very little damping effect on the resonant circuit. A bipolar transistor (T2) provides a gain of around 5 dB. The output signal is coupled to the antenna input of the DCF77 module via a transformer. The secondary of the transformer, in conjunction with capacitors C4 and C5, forms a resonant circuit which must be adjusted so that it is centered on the carrier frequency. An oscilloscope is needed for this adjustment, and a signal generator, set to generate a 77. 5 kHz sine wave, is also very useful. This signal is fed, at an amplitude of a few milli-volts, into the antenna input. With the oscilloscope connected across C4 and C5 to monitor the signal on the output resonant circuit, trimmer C5 is adjusted until maximum amplitude is observed. It is essential that the transformer used is suitable for constructing a...




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

Sound amplitude meter
Phase sequence detector
Digital weight scale
Derived Center-Channel Stereo System
Data Line Remote Short Sensor
Measure your stress level Tension meter Schematic Diagram
Korg Releases monotribe Drum Schematics
door alarm
Speed of Light with an IR LED
Wide Dynamic Range Field Strength Meter
Two Relay-Based Motorcycle Alarm Circuits



Top