Logic Probe by iainhendry December 19, 2013 670 Schematic Logic Probe Parts List QTY PART-REFS VALUE --- --------- ----- Resistors --------- 1 R1 2M2 3 R2,R3,R5 1K 1 R4 4M7 Capacitors ---------- 1 C1 100nf Integrated Circuits ------------------- 1 U1 4001 Diodes ------ 3 D1-D3 LED No related posts. Logic Probe 0 FacebookTwitterPinterestEmail previous post Audio Pre-Amplifier circuit next post Audio Mixer You may also like Logic probe January 31, 2015 Battery Low Voltage Indicator January 2, 2014 square wave oscillator December 19, 2013