Circuit diagrams and schematics - Electronic projects

This circuit can be designed to attenuate signal frequency. Customizable from 1 to 40 dB.If you want to use the band uhf, should be fitted within the frame shield, and C1 to C3 type feeds true.The line should be as short as possible, and the diode should be a kind of low capacity on high [...]

This circuit designs to upward for divide by the frequency of a signal input , give down left just the half then to export come to the way output. Because of the transistor Q1 (BC549) bias stay the condition not active it then active get especial while signal input be positive volt only. This circuit [...]

U1 7555 is a CMOS version of 555 LM555 pdf datasheet. The 555 here is in Astable Oscillator mode, C1 and C4 are decoupling capacitors 0.1uF value, ceramic disc. The output is around 100kHz, If C3 is plastic or mica the frequency output will be stable with temperature. It is better to use a crystal [...]