Electro Harmonix Small Stone Phaser 电路图.pdf

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1、+ Vbias V+ + - LFO 2 3 Vbias V+ 4 751 6 8 10k 27k 1k + 4 1 6 3 2 5 + - LFO 2 3 Vbias V+ 4 751 6 8 10k 27k 1k + + + - LFO + - LFO V+ V+ 0.0068 27k 0.0068 0.00680.0068 27k 27k 10k 4.7k 4.7k 10uF V+ 30k 270k 30k 27k 3.3k 4.7k 27k 0.1 V+ 470k 0.1 4.7k 22k 15k 1k 1.8k 0.1 27k 2N5087 1M 27k7.5k 100 33uf 0

2、.0068 100k 470k33uF10k 15k COLOR SWITCH ON ON OUT IN 9V V+ EFFECT BYPASS Vbias EH Small Stone Phaser Issue J The Small Stone is somewhat unique in using Operational Transconductance Amplifiers (OTAs) for phase shift stages instead of opamps with variable resistors. All of the ICs are house marked EH

3、1048, but can be replaced with CA3094 which is a combination of an OTA equal to the CA3080 and a darlington emitter follower. Later Small Stones used slightly different circuits, but all used the OTA. 2 3 Vbias V+ 4 751 6 8 10k 27k 1k 2 3 Vbias V+ 4 751 6 8 10k 27k 1k 2N5087 2N5088 RadioFans.CN 收音机爱 好者资料库