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Colin Gunn
Colin Gunn vor 23 Stunden
Have operated the Tone defeat switch and the relays RE1 and RE2 works fine  There is a notable sound difference. 
Preamplifier 2012 (1) - introduction and line-in/tone/volume board (110650)
Colin Gunn
Colin Gunn vor 23 Stunden
What should be realised for ampllitude measurement at the output . If the bass was set to minimum and the treble set to minimum .  Volume steady  Then increase the treble to maximum .  I used the Elektor  LCR meter for the following test and measurement Power off. Removed IC4 from socket  Placed the leads from the LCR meter into the IC4 socket pin 1 and 2      Meter High side is on 2 and low side is on 1      Treble pot turn fully counter clockwise      LCR meter @ 10khz      Meter reading   1.0269k ohms , 2.531 nF ,Q 0.163 , Vvx 354.5mV,  Ix 349.7 uA   Treble pot turned fully clockwise  Meter reading   1.8697K ohms , 709.6 pF  , Q 0.083  ,  Vx  369.3 mV,  Ix 198.2 uA   With treble pot connected in parallel with R17 as the treble pot is increased should I not see the over all Ohmic value go down 
Preamplifier 2012 (1) - introduction and line-in/tone/volume board (110650)
Thomas Bunge
Thomas Bunge vor 1 Tag
What are the components on the crowbar 5V circuit? Please give some details. Could it be, that you have a mistake? The step down converter (out+) is connected to pin 1 of the thyristor cathode and the (out-) to pin 2 anode? Reference: your new pcb you shared... From my point of view that wouldn't present a harm to the circuit but no function either. Please clarify...
HV Power supply with tube and semiconductor curve tracer
Tueftler vor 1 Tag
Die Fuses des Atmega32U4 müssen auf folgende Werte gesetzt werden: Ext. 0xCA High 0xD0 Low 0xFF Lockbits 0xFF  
Gardena kompatibler Bodenfeuchtesensor
ElektorLabs vor 3 Tagen
Bass and treble are controlled by the same amplifier, IC4 and IC13. But also selected by the same relay, RE1 and RE2. So, check component values of C8, C9, R17, C33, C34 and R55 (4 x 100 nF and 2 x 1 kΩ) and P3. An identical short circuit or missing contact(s) in both channels is unlikely. Beautifully build! Looks good.  
Preamplifier 2012 (1) - introduction and line-in/tone/volume board (110650)