Username aweijnitz
Member Since December 28, 2012

aweijnitz's Public Circuits:

Now showing circuits 1-8 of 8. Sort by

Line level to Mic level converter

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

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

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

Buffer Pedal PUBLIC

Basic transparent guitar buffer pedal

by aweijnitz | updated May 06, 2020

pedal  

Laser ON/OFF switch using NPN transistor

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)

Transistor Laser control (not working) PUBLIC

by aweijnitz | updated January 20, 2013

Arduino Hygrometer

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

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