From Frank
https://groups.google.com/g/comp.sys.apple2/c/D9Rq_uzVVYw
20/Jun/2023

I was able to wire up a working linear, unregulated power supply using a 12vac transformer into a full-wave rectifier then finally a 560 uf 35v capacitor in series. The lower rating leaves enough ripple in the output to create the 120hz timebase clock signal. The connector is a 5.5mm x 2.5mm center positive barrel jack. 

I'm wondering if Euro units are hard-coded for 50hz instead of 60hz line frequency? Or if the microcontroller is smart enough to tell based on the pulse widths which speed it's running at? Does yours normally keep time correctly? 

BTW the caps to replace are five 100uf 25v and four 10uf 25v. Both Crickets I've worked on needed a touch of new solder to be able to desolder, and both had pretty dry caps. One unit was failed, one working but I could see leakage. All marked "Liberty". 



A list of components inside: 

U1 - custom Street Electronics microcontroller 03-801-00 
U2 - SN74LS02N - 2-input NOR gate 
U3 - TL084CN 340B (TI) - J-FET Op-Amp 
U4 - UA723CN 406E (TI) - Linear Voltage Regulator 
U5 - TLC555CP - Timer/Oscillator 
U6 - TMS5220NL (TI) - Speech Synthesizer 
U7 - AY-3-8913 - 3-voice Programmable Sound Generator 
U8 - AY-3-8913 - 3-voice Programmable Sound Generator 
U9 - LM386N - Audio Power Amplifier 
U10 - LM386N - Audio Power Amplifier 

Q1 - KS2N4401 - NPN transistor TO-92 
Q2 - KS2N4403 - PNP transistor TO-92 
Q3 - KS2N4403 - PNP transistor TO-92 

REG - 3 pin TO-92 voltage regulator? (can't read markings) 

RN1 - SCCO 10-9-5-R 47K(?) resistor network (Stackpole?) 

XTAL - 4.9152 MHz (microcontroller clock / UART-friendly frequency)