Assembly completed. The 12V AC supply next.
Author: Melv
Ready For Assembly
Holes drilled, front and rear:
Preamp 2. Making a Start
YX-1707 Preamp
I’ve made an AC 12-0-12 power supply, and rigged up the signal generator and oscilloscope. Looking good.
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XR2206 – New Pot for Square Wave
Added 100K pot, top right, to adjust the square wave amplitude:
Output from Preamp
Around 1 volt peak-to-peak going to the amplifiers:
But the square wave output from the signal generator is 12 volts, and can’t be adjusted:
The Pocket Oscilloscope DSO 138
A bit of a game with the case, and sticking buttons, but got there in the end:
Tested
Step 1 – connect 9 volt battery – Good. Nothing getting hot. Set jumper to 100-3Khz
Step 2 – connect sine wave output to Lepy 2024A amplifier – Good. All knobs working