“Facts are stubborn things” (John Adams, et al). I added two 50-ohm outputs to the schematic of my published voltage-to-frequency converter (VFC) circuit [ 1 ] (Figure 1). Then, I designed a PCB, purchased the (mostly) surface-mount ...
Recently, we’ve seen Design Ideas for programmable current sources with improved accuracy using the LM3x7 series of three-legged regulators. These designs also take advantage of those classic devices’ built-in anti-overheating features. ...
The project presented here is a professional quality phantom powered microphone pre-amplifier (Figure 1). The project is built using the INA163 chip from TI. The Chip is a very low-noise, low-distortion, monolithic instrumentation amplifier. R2 and ...
Brief intro to vactrols Vactrols, or both an LED and a light depending resistor (LDR) ( Ref. 1 ) in a light-tight housing, are found in analog music electronics circuits like audio compressors, voltage-controlled amplifiers (VCAs), ...
My Design Idea (DI), “Flip ON Flop OFF for 48-VDC systems“ ( Ref. 1 ), was published and referenced Stephen Woodward’s earlier “Flip ON Flop OFF” ( Ref. 2 ) circuit. Other DIs published on this subject matter were for ...
Some applications require a hot-swap controller, a circuit-breaker function, or both for dual-polarity, dc-input power-supply rails. In some hot-swap cases, the requirement is based only on inrush-current considerations. Control of the inrush ...
A simple, permanent-magnet dc motor is an essential element in a variety of products, such as toys, servo mechanisms, valve actuators, robots, and automotive electronics. In many of these applications, the motor must rotate in a given direction ...
This circuit uses a low power op Amp and a p-channel FET to form a diode function with a very low 0.05 volt voltage drop. With the selected FET, the circuit can handle up to 2 Amps of current. Higher currents are possible with a FET with a lower ...
I designed the circuit in Figure 1 as a part of a data transmission system that has a carrier frequency of 400 kHz using on-off keying (OOK) modulation. Figure 1. A digital frequency divider circuit that detects the presence of a 400-kHz carrier, ...
Two inexpensive ICs divide a TTL clock signal by 1.5. By following the circuit with another flip/flop, you could also generate a divide by three function. Materials on the topic Datasheet Texas Instruments SN74HCT02 Datasheet Texas Instruments ...