aweijnitz's Profile

Line level to Mic level converter PUBLIC

Convert line level signal to mic input signal level. Level out = V1 * (R2 +R3)/(R1 + R2 + R3). The actual R values are not so important. Important is the ratio between them. Example: 1 volt in and...

by aweijnitz | updated June 13, 2020

audio  

Adjustable Second Order Active Lowpass Filter PUBLIC

Lowpass filter with two knobs. One for cutoff and one for gain (R3). Based on a non-inverting op-amp setup.

by aweijnitz | updated May 07, 2020

Basic Signal Mixer PUBLIC

Mixer based on this article. https://www.circuitlib.com/index.php/tutorials/product/39-how-to-build-an-audio-mixer

by aweijnitz | updated May 06, 2020

Buffer Pedal PUBLIC

Basic transparent guitar buffer pedal

by aweijnitz | updated May 06, 2020

pedal  

Laser ON/OFF switch using NPN transistor PUBLIC

How to hookup a laser module to an Arduino, using an NPN transistor to control it. Calculation, based on 20mA typical operating current draw from the laser module. Ic = 20mA = 0.020A Ib = Ic/10 =...

by aweijnitz | updated January 20, 2013

arduino   laser   npn-transistor  

Transistor Laser control (not working) PUBLIC

by aweijnitz | updated January 20, 2013

Arduino Hygrometer PUBLIC

Illustration showing how to build an Arduino-based hygrometer using the EFS-10 humidity sensor in combination with an LM135 temperature sensor.

by aweijnitz | updated January 05, 2013

arduino   efs-10   humidity-sensor   lm135   temperature-sensor  

Humidity Sensor, EFS-10 measurement circuit PUBLIC

How to hook up the EFS-10 humidity sensor to an Arduino. Sketch need to generate a square wave over D0 and D1 to read value at A0.

by aweijnitz | updated January 02, 2013

arduino   efs-10