MY E-BLOCKS 
ELECTRIC & ELECTRONIC BUILDING-BLOCKS
for LEARNING & TEACHING from 1960 ... 2020+
AN EXPERIMENT ...
< This Chapter was made because bordom in "CORONA(2020-22)LOCKDOWN" >
... Take a MULTIVIBRATOR-DIAGRAM - Make it with the Blocks, e.g.:
Exchange Resistors and/or Capacitors and observe results:
t1 ~ R1*C1 ; t2 ~ R2*C2 ; T = t1 + t2 ; f = 1/T
... In this Moment the OSCILLOSCOPE reads:
T = ( .2 + .5 ) msec = .7 msec ==>> f = 1/T = 1429 Hz
THE BUILDING-BLOCKS:
... Resistors, Switches, Keys, Spools, Relays, Loudspeaker, ...
... Capacitors, Variable Capacitors, Potentiometers, ...
... Ge- & Si-Diodes, ZENER-Diode, LDR, PNP- & NPN-Transistors, ...
... ( 1965 - 1986 ) "E-WERKSTATT-HILFEN"
"ENTWICKLERIDEEN" ...Glimmlampen-Indikator für Isolationsprüfungen
Transistor-Multivibrator im Tastkopf
Transistor- und Dioden-Tester
Signalverfolger-Tastkopf
Mapping-Test = Ein preiswerter Kennlinienschreiber
Kleine Widerstandsdekade
Wobbelbarer Nf-Generator
"Kalte-Lötstellen"-Tester & Morse-Trainer
Leistungstransistoren, Thyristoren u. Triacs preiswert testen
Kompakte Hochlast-Experimentier-Widerstandsdekade
Vielseitiger Telefon-Lautsprecherverstärker
... Using also the didactic INSTRUCTIONS of HEINZ RICHTER / KOSMOS ...
... with the »ULTRON« / KOSMOS ( see MULTIMETERS ... )
... and my TRANSFORMER in a TEA-CAN ...
... and with my Multi-Purpose Battery/Charger/Power-Supply ...
... Have a Look at my "professional" Power Supplies ...
... + RESTORATION OF A WWII TELEGRAPH SET ...
... + HOW A TELEPHONE DIAL SYSTEM WORKS ...
***** T H E H I S T O R Y *****
All started 1956 in (WEST-)Berlin with learning the MORSE CODE ...
and with the design of my SHORT-WAVE-AMATEUR-RECEIVER ...
... Ready to LISTEN THE WORLD ...
... also a »KYORITSU« GRID-DIP-METER(*) became necessary ...
(* µA-Meter makes a Zero-"Dip" in Resonance )
... to measure "Resonance-Frequences" of LC-Circuits !!
... continued with my TUBE-EXPERIMENTAL-KIT ...
... For powering VACUUM TUBES with 250 VDC & 6.3 VAC,
I bought and assembled the »UNIVERSAL-NETZGERAET« Kit
from »RadioRIM« / Munich in 1962
Attracted to ZEITGEIST »CYBERNETICS« N.WIENER + K.STEINBUCH ...
Ein "LICHT"-EXPERIMENTAL-BAUSTEIN gebaut 1963 ... Ein "ZEIT"-EXPERIMENTAL-BAUSTEIN gebaut 1964 ... 
... and beyond into IC-TECHNOLOGY / Building-Blocks ...
... LEDs, OpAmps, Registers, Multiplexers, Function Generators ...
!!! WOW !!!
The E-LABOR needs also 115 VAC (= USA ) realized with
(a) ISOLATION-TRANSFORMER in a COOKIE-BOX ( Picture above )
(b) VARIABLE-TRANSFORMER ( Picture below )
( Input = 220 VAC / Output = 0 ... 260 VAC / 520 VA / 2 Amax )
With BATTERY-PACKS out of RECYCLED Li-Ion-Cells ...
and with MULTIMETERS for Development & Repair ...
and D E M O S and P R O J E C T S ...
... F O R F U N with CHILDREN of Friends & Neighbors,
these E-BUILDING-BLOCKS / "An Electro Technics Primer"
had planted the wish "to become also an ENGINEER" ...
... As HERAKLIDOS has said:
" Teaching is NOT filling Buckets - It has to SPARKLE MINDS !"