More circuits about oscillator, pulse, frequency , and others.
These are four 1.5V FM transmitter circuit (low volt) which use transistor and a few parts, without PCB but easy to build for output 88-108MHz or 90-100MHz, more circuits below [...]
This simple AM transmitter circuit include of many parts. There is a transistor Q1 act as increase the audio signal (AF) from the crystal microphone and...[...]
See idea: Voltage to frequency converter circuit use CA3130 OP-Amp, that linearity Of changing up to 0.5% and Temperature coefficient.
ECG simulator circuit is very useful in the medical community. Such as experimental research - development of bio-medical image, using Digital IC as main [....]
This is Simple VCO circuit using schmitt trigger using 74HC14__Hex inverting, which inside have 6 schmitt trigger, but applied one frequency controller