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Essentially, this is a Hartley oscillator utilizing a triple-emitter follower, suitable for audio and low radio frequencies. The frequency is determined by the components, and at 1 kHz, a typical capacitor value would be 4.7 µF tantalum, although this...
This circuit is designed to be driven by a 1-MHz standard signal with an amplitude of several volts. The components U1 through U5 are 7490 decade counters/dividers, providing a division ratio of 100,000:1. It is possible to tap off...
The design utilizes the LM386n-1 integrated circuit, powered by a single power supply to maintain a compact layout. There is a need to control the frequency, and the user is inquiring about which component values should be adjusted for...
Alternative display methods exist beyond the original 8 LED frequency counter, potentially offering improved readability and a more suitable format for QRP equipment. This document presents examples of binary decimal displays. Typically, the counter omits the MHz position, focusing...
The following circuit enables measurement of the inductance of the inductor labeled LX, which is the inductance to be measured. The output of the circuit is a TTL square wave whose frequency relates to the inductance being measured. The...
The circuit consists of three identical basic stages, with the second stage featuring a differential output from the power MOSFET, 2SJ77. A current mirror circuit utilizing 2SK214 is implemented. The operating current is 6mA; however, due to the power...
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