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Easy in-line rf wattmeter circuit
Published on 2012-02-09 10:29:52
This is a little ideas of Easy In-line RF wattmeter circuit, it is insensitive to frequency, so calibration will be correct better than a wide frequency spectrum. For example the whole amateur HF spectrum; If the values of L2, the voltage divider at capacitors C1 and C2, and the resistances of R1 and R2 are [...]
The Safe constant current source.
Published on 2012-02-07 01:32:02
Figure the top is a Safe constant-current source circuit, how it works? A cmos op-amp (number ICL 7611) controls the input current through a P-channel Hexfet power transistor (No. IRF 9520), then to keep up a constant voltage across the R1. As they are connected in a serial form, so use the together current by: [...]
The universal battery charger using Lm317
Published on 2012-02-04 04:51:09
Here comes very simple idea is the universal battery charger circuit. When, an input power is applied to the circuit. The SCR1 (Silicon controlled rectifier) turn off, then not has a bias current path to ground. The LM317 acts as a current regulator, It is connected to the battery thought a one way diode D1, [...]
